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The only way to incorporate a 3rd party receiver into the Sonos system is to use a Port. You could connect via Bluetooth, but that Marantz is only a Bluetooth receiver, not a transmitter.
Can you link to the manual for those of us not familiar with this Marantz device?
The Roam can be connected to via WiFi, using the Sonos app, or via Bluetooth, from any Bluetooth generating device. The Roam does not have a line in, though.
The only way to incorporate a 3rd party receiver into the Sonos system is to use a Port. You could connect via Bluetooth, but that Marantz is only a Bluetooth receiver, not a transmitter.
As stated, you need to connect a Sonos Port’s line-in to the Analog Outs on the Marantz. Note, the analog input on a Port will be delayed 75 ms from the source to account for buffering.