Using MBP's Trackpad as a tablet for painting with a pencil?


I am completely new to BTT and in search for the following setup.
As a photographer I use the editing software Capture One (could also use Lightroom, if better suited for the setup). Long story short, I am looking for a way to do local adjustments with a pencil without buying a new iPad or any other tablet to connect to my MBP 16-inch. I would like to find/create a way to use Apple pencil or any other pencil which is suitable, to paint on my Trackpad on MBP. The trackpad is big enough (almost as big as some tablets I could buy for this purpose).

Do you have any suggestions or ideas how I could achieve this?

Thanks in advance.