At the moment, you cannot increment a number global variable by touching it. The workaround is to use the text variable as a number and increment it with a formula. I suggest to add an option to increment a number variable on touch with a choice after reaching the upper limit of whether the number will be max or if the number will wrap back around to the minimum.
I’d also like this functionality.
While there are acceptable workarounds, they’re all cumbersome
I believe you can do something like this already using Flow. You can find some examples of how Flow works from the link below.