How to abort jumping?

Hello everyone.

I'm using platformer behavior. My character just jumps if he comes into contact with the floor, for this I use an imitation of pressing the jump button.

Question: how do I make my character stop gaining height at the moment of jumping and start falling when I click the mouse button.

Please help me.

P.S. I hope it was clearly shown in the picture

I usually do it this way

You can adjust the factor (0.2) depending on how sudden you want the jump to be shortened.