Mouse & Keyboard via Game Stream?

The Xbox can't be controlled by keyboard and mouse through the Stream mode at all. While it's possible in the Minecraft Bedrock Edition to use Keyboard and mouse, all other games don't accept keyboard and mouse input at all.

You might have to try Minecraft, if you can control it via Keyboard and mouse while streaming to your PC.

I think it is needed to add support of keyboard and mouse when streaming via xcloud in PC.

If the game is native to the PC virtually all of them should support mouse and keyboard. If you are streaming Xbox games via the cloud, many of them require a controller

Yes but what if I want to use the mouse and keyboard while streaming, I dont want to have to unplug my desktops mouse and keyboard and connect it to my xbox when I have the ability to play from here. Can I play mouse and keyboard supported games through
streaming?

you can only use a controller streaming the console to pc, you cannot use mouse and keyboard on console via pc, but you can use mouse and keyboard directly on the console as there is quite a few games that support it, also people use adapters for games that don't.

but don't forget some games are crossplay with pc which mean you will be against players that use MnK or gamepad on pc.