Once you become sm, you could do a preposition to help build a map like that and maybe this minigmae could be added in the future, the only disadvantage prison maps should be very good designed and there is a complete other monetary system than the usual, also there should be self restoring mines set up so it is nearly impossible to add this very soon, also I don't think any people will play it, a prsion world can only succeed if there are many players on at the same time (and playing ) in that world, maybe you have seen that not many advanced / experienced players play a lot of minigames so I really doubt if this is gonna be implemented.
Sincerly
eagler1997
p.s you could ask a higher ranked staff and maybe discuss it with them
