I find using the power-button + down-volume button extremely cumbersome especially when taking time sensitive screenshots.
Is it possible to do this using a shortcut key on a bluetooth keyboard?
PS - remember to turn battery optimization off for the app otherwise if the system closes the app then no hardware buttons will work and you'll have to reboot.
adb shell
you can execute thescreencap <filename>
command exactly when you need a screen shot.