Here is a full example JSON for such a button:
[
{
"BTTLastUpdatedAt" : 1691743992.448612,
"BTTTriggerType" : 773,
"BTTTriggerTypeDescription" : "Standard Item",
"BTTTriggerClass" : "BTTTriggerTypeFloatingMenu",
"BTTPredefinedActionType" : 281,
"BTTPredefinedActionName" : "Run Real JavaScript",
"BTTAdditionalActionData" : {
"BTTScriptType" : 3,
"BTTAppleScriptRunInBackground" : false,
"BTTTouchBarAppleScriptString" : "(async () => {\nlet itemUUID = \"DDB37019-4673-4313-9386-E583A9DF0127\";\n\n\nlet variableName = 'buttonShouldBeGreen';\n let isGreen = await callBTT(\"get_number_variable\", {variable_name: variableName});\n \n if(isGreen == 1) {\n \t\tcallBTT(\"set_number_variable\", {variable_name: variableName, to: 0});\n\t\t\n\t\t const updateDescription = {\"BTTMenuItemBackgroundColor\" : \"200, 0, 0, 170\", \"BTTMenuItemText\": \"Red\"};\n \t\tawait callBTT('update_menu_item', {\"item_uuid\": itemUUID, \"json\": JSON.stringify(updateDescription)})\n\n\t\t\n \treturnToBTT( 'changed to red');\n \n } else {\n \tcallBTT(\"set_number_variable\", {variable_name: variableName, to: 1});\n\n \t const updateDescription = {\"BTTMenuItemBackgroundColor\" : \"110, 190, 100, 200\", \"BTTMenuItemText\": \"Green\"};\n \t\tawait callBTT('update_menu_item', {\"item_uuid\": itemUUID, \"json\": JSON.stringify(updateDescription)})\n\n\t\t\n \treturnToBTT( 'changed to green');\n }\n})()",
"BTTTouchBarAppleScriptUsePath" : false
},
"BTTGenericActionConfig" : "(async () => {\nlet itemUUID = \"DDB37019-4673-4313-9386-E583A9DF0127\";\n\n\nlet variableName = 'buttonShouldBeGreen';\n let isGreen = await callBTT(\"get_number_variable\", {variable_name: variableName});\n \n if(isGreen == 1) {\n \t\tcallBTT(\"set_number_variable\", {variable_name: variableName, to: 0});\n\t\t\n\t\t const updateDescription = {\"BTTMenuItemBackgroundColor\" : \"200, 0, 0, 170\", \"BTTMenuItemText\": \"Red\"};\n \t\tawait callBTT('update_menu_item', {\"item_uuid\": itemUUID, \"json\": JSON.stringify(updateDescription)})\n\n\t\t\n \treturnToBTT( 'changed to red');\n \n } else {\n \tcallBTT(\"set_number_variable\", {variable_name: variableName, to: 1});\n\n \t const updateDescription = {\"BTTMenuItemBackgroundColor\" : \"110, 190, 100, 200\", \"BTTMenuItemText\": \"Green\"};\n \t\tawait callBTT('update_menu_item', {\"item_uuid\": itemUUID, \"json\": JSON.stringify(updateDescription)})\n\n\t\t\n \treturnToBTT( 'changed to green');\n }\n})()",
"BTTGenericActionConfig2" : "",
"BTTRealJavaScriptString" : "(async () => {\nlet itemUUID = \"DDB37019-4673-4313-9386-E583A9DF0127\";\n\n\nlet variableName = 'buttonShouldBeGreen';\n let isGreen = await callBTT(\"get_number_variable\", {variable_name: variableName});\n \n if(isGreen == 1) {\n \t\tcallBTT(\"set_number_variable\", {variable_name: variableName, to: 0});\n\t\t\n\t\t const updateDescription = {\"BTTMenuItemBackgroundColor\" : \"200, 0, 0, 170\", \"BTTMenuItemText\": \"Red\"};\n \t\tawait callBTT('update_menu_item', {\"item_uuid\": itemUUID, \"json\": JSON.stringify(updateDescription)})\n\n\t\t\n \treturnToBTT( 'changed to red');\n \n } else {\n \tcallBTT(\"set_number_variable\", {variable_name: variableName, to: 1});\n\n \t const updateDescription = {\"BTTMenuItemBackgroundColor\" : \"110, 190, 100, 200\", \"BTTMenuItemText\": \"Green\"};\n \t\tawait callBTT('update_menu_item', {\"item_uuid\": itemUUID, \"json\": JSON.stringify(updateDescription)})\n\n\t\t\n \treturnToBTT( 'changed to green');\n }\n})()",
"BTTUUID" : "DDB37019-4673-4313-9386-E583A9DF0127",
"BTTEnabled" : 1,
"BTTTriggerName" : "Menu Item: no-name-DDB3701",
"BTTMenuConfig" : {
"BTTMenuItemMaxHeight" : 50,
"BTTMenuItemMinWidth" : 100,
"BTTMenuAlwaysUseLightMode" : 1,
"BTTMenuItemBackgroundColorDark" : "108.442, 96.000, 190.435, 166.991",
"BTTMenuElementIdentifier" : "no-name-DDB3701",
"BTTMenuItemBorderColorHover" : "255.000000, 255.000000, 255.000000, 255.000000",
"BTTMenuItemVisibleWhileInactive" : 1,
"BTTMenuCategoryBackground" : 1,
"BTTMenuItemDisplayOrder" : 0,
"BTTMenuItemBackgroundTypeDark" : 4,
"BTTLastChangeUUID" : "63FD82F1-1AB5-4D7C-BC11-5CF56585921D",
"BTTMenuItemBackgroundType" : 4,
"BTTMenuItemBackgroundColorHoverDark" : "90, 90.000, 180, 166.991",
"BTTMenuItemBorderColorHoverDark" : "255.000000, 255.000000, 255.000000, 255.000000",
"BTTMenuCategoryItemSizing" : 1,
"BTTMenuItemBackgroundColor" : "201.916073, 0.000000, 0.000000, 166.990997",
"BTTMenuItemBackgroundColorHover" : "110.000000, 193.000000, 56.000000, 200.650222",
"BTTMenuItemMinHeight" : 50,
"BTTMenuItemBorderColorDark" : "255.000000, 255.000000, 255.000000, 255.000000",
"BTTMenuHoverEndAnimationDuration" : 0.14999999999999999,
"BTTMenuItemBorderColor" : "255.000000, 255.000000, 255.000000, 255.000000",
"BTTMenuAttributedText" : "[\"Change Color\",{\"NSColor\":\"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"BTTMenuHoverStartAnimationDuration" : 0.14999999999999999,
"BTTMenuItemMaxWidth" : 200,
"BTTMenuItemVisibleWhileActive" : 1,
"BTTMenuItemIconColor1" : "255.000000, 255.000000, 255.000000, 255.000000"
}
}
]