Im wondering if it is possible to make the player jump higher if the player is holding the jump button, like in most patformers.
Below in the documentation is a sample code which implements holding a button to trigger something.
https://docs.coregames.com/api/camera/#isdistanceadjustable
I think you could modify that to add velocity/impulse to the player to increase height while holding the jump button.
Try playing with gravityScale player property inside on space down and up events.