How can i do adjustable jump strength?

Hi,

I'm programming an Ai and want npc to jump only as high as they have to within the jump limit. sp lets say i have an obstacles that one is only 20px and the other 60px height and i want npc to jump only slightly above those so he can reach both and continue moving forward.

Also another thing is how to make npc jump on the overlap at offset? I've tried it myself but they either jump constantly or don't jump at all.

Thanks