Look into X11 forwarding if the guest uses X11 (xwayland will happily play along if you use waykand on the host) or try something like way pipe if you want a full Wayland solution. Both will display an app over network as if it was running locally, but they do require a bit of setup with ssh.
You may also be able to trick RDP into displaying one app remotely like winapps does if you don’t want to deal with ssh.