Note that just because a feature isn’t built in doesn’t mean you can’t implement the desired functionality yourself. You could potentially do this via a BlueOS Extension, either by developing your own, or by using one of the development-focused ones like the Jupyter or VSCode Extensions, in which case
That said, if a servo tester (or similar setup with an Arduino or the like) is sufficient to resolve your actual problem at the moment, then it’s quite possible that will be simpler 