📐 Create Convex Decomposition From 2D Triangle Mesh?

I have a 2D triangle mesh that I want to do a convex decomposition on, but the `convex_decomposition` function only takes a triangle mesh in 3D mode, and it takes a polyline in 2D mode. Is there a way to either:

1. Create a convex decomposition from a 2D triangle mesh, or
2. Create a polyline from a 2D triangle mesh?

I'm not super geometry math savvy so I'm not sure if there is a simple algorithm to convert a 2D trimesh into a polyline or not.