I found this tutorial
In the YouTube Video (123) Rokoko Live Plugin for Unreal Engine 5 - Beta Release - YouTube they show how they converted their plugin to UE50EA. In the Git Hub Repository Rokoko/rokoko-studio-live-unreal-engine at master_5_0EA (github.com)
Contains all the UE50EA converted materials. Most importantly the conversion of the " UnrealSampleProject.uproject to UE50EA.
Plugin conversion is quite a hard task, so it’s a nice tutorial
The location on Epic Marketplace is
Rokoko Studio Live in Code Plugins - UE Marketplace (unrealengine.com)