Double Jump using First Person Controller

Hi guys, i’d like to create a double jump for my first person game. I’m using the default first person controller prefab. I have no idea how to do this, i’ve searched around but they’re all using different prefabs and scripts. Any help would be appreciated, thanks.

I would like him to hit space to do a normal jump, and when in mid air if you hit space again it will repeat the jump from the position in mid air. I hope that makes sense xD