Hi there were these two from from last year …hove you looked at these yet?
the first one - ive got a platform character in top down and i create a hidden platform object under it when needed. You can turn the platform character behaviour and or the platform behaviour off and on and its a case or getting the logic in the right order.
Make my character jump - Top Down Behaviour - How do I…? - GDevelop Forum
Anyone made this already - faking a jump effect in top-down? - GDevelop general - GDevelop Forum
i think that there’s other threads on this too