How do i make a 2d gui point to a part in a 3d space?

I want to make a game that uses speech bubble just like in pokemon brick bronze but i have no idea how to make this wierd arrow that points to the characters’ heads.(shown in gif below)

2022-09-16 18-04-46 (online-video-cutter.com)

I tried looking something up about 2d guis in 3d spaces but it only showed me articles about billboardguis.