So a few months ago I had a conversation with a few moderators in the discord channel about my Videocard (MSI RTX 3080 Gaming X Trio).
They told me that it is only possible to detect all their leds as one rgb led. I was also told there was a workaround but that one will not work for my case. which would be swapping the fan cables (Aparently the cables for them are called Micro JST cables).
After finding out it will not work for my gpu I once again began searching and found another program which is able to see and change all leds seperately.
The good part is that they have an open source github page which might help you to add support for MSI devices.
I think the following page might be able to help: https://gitlab.com/CalcProgrammer1/OpenRGB/-/tree/master/Controllers/MSIGPUController
Also their root folder: https://gitlab.com/CalcProgrammer1/OpenRGB
I hope this helps you add support for MSI devices