Calculete points in circle

Hello i am making something like 2D minecraft. Im currently woking on trees but i dont want to add every leaf position to index and then always get the same generic tree structure(until i add more leaf pooses) . So i want to ask if there is some way to automate this proces.

https://answers.unity.com/questions/1913016/randomly-spawning-items-within-radius-of-the-playe.html?childToView=1913083#answer-1913083