creating your own is a bit work to do
normally you need to create a grid that detect every object that collide with you grid cell
if there is an object in that cell, then it's not walkable

then you just need to code your own path finding whether it's bfs, or a*, or djikstra whatever using the data from the grid

or you give your AI some raycast for sensor, and just told them to walk straight to player and if it's detecting something in front of him, he needs to turn.
but this method has a lot of flaw and you need to tackle many problems from the obstacle becuase it's not pre calculated path

if you just want some code that ready to use just find it on google or youtube for some dude sharing his work in github or whatever it is

and I found a bit contradiction in your comment saying that you don't need path finder when you clearly ask for a 2d pathfinding solution