Simulating two finger trackpad drag with normal mouse

Use case: I have an MX Master 4. I want to press&hold the thumb button and then drag the mouse for simulating a 2 finger drag like on trackpad. This would be really useful in Excel and large PDFs.

For achieving this, I would assing a keyboard combo to the thumb button in Logi+. But how can I configure the dragging in BetterTouchTool?

Any help?