Hi Ertan,
I edited my first reply to include info about streaming. Unfortunately the resolution is a limitation within AirPlay, and was one of the drivers for Roon to develop RAAT.
You can read further about network Outputs in Roon here.
What I would suggest for you is:
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directly connect your Roon computer to a digital input in your existing gear. This is not network streaming but is one way of listening to hi res Roon for evaluation purposes.
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Use a Raspberry Pi or Allo Sparky to run Diet Pi and Roon Bridge. This can then connect from Ethernet to a USB digital input on your existing gear. Other digital outputs such as spdif coax or Toslink can be supported with add on boards.
The Pi does a fine job for all PCM resolutions and up to DSD 128 but the Sparky is preferable for DSD 128 or higher. You will find a thread about DietPi installation here. There are many users without Linux experience who have painlessly installed Roon Bridge and are enjoying hi res streaming Roon. The Forum is always happy to help in this regard.