I am looking for an algorithm, which will convert an image of a symbol to a spline. I need a set of vertex points and tangents, suitable for Unreal Engine spline. Preferibly, written in C++, but I don’t mind any other language.
What I need
What I need, but smooth
Is there anything, that will suit my needs, or will I need to compose something myself?

I tried searching, but didn’t found anything