Yep, would be good - been requested since 2017…
GR meters in MixConsole Channel (like StudioOne) - Cubase - Steinberg Forums
Already present in the MixConsole Meter Bridge when using the stock ChannelStrip compressors only, but like you say, needed for other SB tools and for 3rd Party plugins too - in the MixConsole Channel Faders/Meters.
Steinberg could take advantage of the freely available Presonus Plugin extensions they developed, in order to achieve this. They can choose which to implement, as they see fit.
In terms of this thread’s topic, they could support Gain Reduction reporting in the plugin, back to the host UI - something other 3rd party plugin devs have already built-in to their tools. So that part’s already done, by quite a few 3rd parties so far. No more work for the plugin devs; no need for them to reinvent the wheel, to have them work inside Cubendo…
Here’s the documentation Presonus provide:-
PreSonus Plug-in Extensions (presonussoftware.com) - see page 12 - GR Info reporting
From this page:- Scroll down to bottom
(Developer | PreSonus Software)
PS:- finally, one other thread of interest here; GR Meters in Channels (like S1 and PT) - Cubase - Steinberg Forums