There’s some details here in another post thanks to @lazortech13. As far as packaging it so you can use it in another project, I extracted it from City Sample and put it up on GitHub here: GitHub - LeroyTechnologies/AnimToTexture: UE5 plugin from Epic's City Sample project to convert animations to textures
I have an example of how to use it in this project I’m working on: GitHub - LeroyTechnologies/ProjectM at wip-soldier-walking-animations. Note I linked to a specific branch because this work isn’t merged to main branch yet. The readme there towards the bottom explains how to add the AnimToTexture plugin via the GitHub repo to a UE project.