Ultrawide monitor support (2560x1080) on AndroidTV 13.0?

I have a chinese AndroidTV box, with Android 13. Resolution in the settings are standard - 1920x1080, 4K etc. No ultrawide. I have tried changing through adb wm size, but it chooses the closest supported resolution - 4K. Is there a method to achieve that with some custom rom I don't know about? Or some other method? Thanks