How would I go about centering a texture on a stretchable 3d shape?

Here is an example: https://ibb.co/p1pdgCY

I am making a tool where I can stretch some beveled 3D shapes and I need the texture to be in the center despite stretching it. I thought about doing a decal but I feel there must be another way to achieve this. This has been stumping me for a while. The texture needs to only be displayed once per side and possibly be on two parts of the cylindrical curve.