Mouse.Move() in relation to window upper left corner

I was wondering if there is any way to use the mouse.move() function to position the mouse relative to a focused app's window?

For example, there is a windows app that I like to use and I generally position the app/window on my screen manually. There is a button on this app that I'd like to use the mouse.click() function to click on to start up this app inside its own window.

I have the X,Y coordinates of this pwr on button to mouse click but if I position the app differently then the X,Y mouse.click() might not 'hit' its target.

Is there a way to mouse.move() relative to the app's upper left corner 0,0 coordinate?

Thanks...

Is there a way to mouse.move() relative to the app's upper left corner 0,0 coordinate?

No. The mouse events that are generated are EXACTLY the same as those generated by your real mouse. It has not a clue what any specific application is going to do with those events or even which application is going to get the mouse events.