Get existing Watches

Is there any way to get a list of listeners created by setWatch()?

I was thinking about creating a global listener, so it would be nice if it could do something like

setWatch(()=>{
  // check only this function is listening
  if (getWatches(BTN1).length === 1) doCoolStuff();
}, BTN1);

And that would allow me to doCoolStuff by pressing BTN1 from e.g. most clocks, but without interfering with apps that actually use BTN1.

And I guess the same question for Bangle.on()? (Because I just realized it would be neat to swipe from the clock to settings/launcher)