Need SERIOUS help with making a JUMP CURVE for my 3D platformer!!!!

Hey guys, I have looked absolutely everywhere but have had 0 luck. I’m trying to implement a jump curve. Where the gravity starts slower and increases as the jump hits the peak height, making my character feel more weighty.

Here is my code so far, I’ve tried using timelines and gravity scale but haven’t been able to make anything succeed. NEED HELP !!! THANK YOU