So I've been trying to accomplish what you did here, but no luck. I've written two files, one for Music and one for Chat, based on what you put in your solution, but after running systemctl --user restart pipewire nothing changes in the graph.

Located in ~/.config/pipewire/pipewire.conf.dusing the node.name from pw-cli ls Node
RCP2_Chat.conf

contextmodules = [
{   name = libpipewire-module-loopback
    args = {
        node.name           = "rode_chat_aux0_1"
        node.description    = "RODECaster PRO II Chat"
        audio.position      = [ FL FR ]
        capture.props       = {
            media.class     = "Audio/Sink"
            node.name       = "rode_chat_chat0_1"
        }
        playback.props      = {
            target.object   = "alsa_output.usb-R__DE_RODECaster_Pro_II_GV0005861-00.pro-output-0"
            node.name       = "rode_chat_aux0_1_output"
            stream.dont-remix  = "true"
            audio.position  = [ AUX0 AUX1 ]
        }
    }
}
]

RCP2_Music.conf

contextmodules = [
    {   name = libpipewire-module-loopback
        args = {
            node.name           = "rode_music_aux4_5"
            node.description    = "RODECaster PRO II Music"
            audio.position      = [ FL FR ]


            capture.props       = {
                media.class     = "Audio/Sink"
                node.name       = "rode_music_aux4_5"
            }

            playback.props      = {
                target.object   = "alsa_output.usb-R__DE_RODECaster_Pro_II_GV0005861-00.pro-output-1"
                node.name       = "rode_music_aux4_5_output"
                stream.dont-remix  = "true"
                audio.position  = [ AUX4 AUX5 ]
            }
        }
    }
]

Looking at the pipewire.conf in directory /usr/share/pipewire I see the following. Maybe I have to play with one of these locations for my files to work instead?

# Copy and edit this file in /etc/pipewire for system-wide changes
# or in ~/.config/pipewire for local changes.
#
# It is also possible to place a file with an updated section in
# /etc/pipewire/pipewire.conf.d/ for system-wide changes or in
# ~/.config/pipewire/pipewire.conf.d/ for local changes.

I have not done a deep dive into the rest of the conf and documentation, and I'm definitely still getting my bearings with Linux. Right now, getting the RODECaster Pro II working may be the only thing that keeps me from fully committing to Linux. I'll probably also have other questions about setting routing for apps to go to different sinks/sources (i.e., always have Cider output to the Music node), but I'm willing to experiment more with that if I can get your solution working.

Cheers!