Loading XR Plugin Providers in custom order

Hello, I am trying to use the Varjo XR-3 with its video-seethrough capabilities together with vive trackers. In order to properly use the video-seethrough function I need the Varjo XR-Plugin. To use the Vive-trackers I need the OpenXR-Plugin. According to Varjo it works to use both plugins at the same time (Unity XR SDK Compatibility | Varjo for developers) but they say, that the Varjo XR-Plugin should be initiliazed first, linking to the unity documentation. Now I don’t really understand the Unity documentation and can’t get it to work.

Therefore I am asking: How can I initialize the varjo XR-Plugin first, and the OpenXR Plugin second, at the beginning of runtime, so that I can use the Varjo XR-3 with video-seethrough in the editor? How would such a script look like?
I don’t understand when, where and how to call the initalization, because apperently it needs to be done before the start method is called.

I have similar requirement: Need to use Vive ultimate trackers in Quest 3 with Passthrough. I need to run the OpenVR loader plugin first and then the Oculus Plugin. Have you found the solution?