Rose RS150 + Anthem AVM70 volume control

Hi to everyone,
My Roon Core is a Mac Mini, my end points are a streamer Rose RS150 (via USB) and a preamplifier Anthem AVM70 (via HDMI)
The system works fine.
The sound is excellent.
I wish to know if I have the possibility to control the volume level of the pre AVM70 directly from my iPhone XS max running iOS 14.6