Thanks for your question.
In the package, you will find several nodes (Amplify and Shader Graph) and examples (VFX Graph, Particle system).
Those examples will show you on how to use motion vectors and can help you build your own specific shader based on the data you have access and you can provide to the materials.
Also I just made a quick test with Single Row and Random Row mode and it works well.
If you want to do more custom flipbook animation, you would just have to create another shader similar to the screenshot and change the OpticalFlowUVAnimation node to handle your own way of animating. Then provide the resulted current and next frame in addition to the blending factor.