[GRASS-dev] G7: how to reach new i.group dialog window from command line?

Hi,

thanks to Stepan and others, the new i.group dialog now nicely support
subgroups.
However, how to launch it from CMD line?

I am aware of the r.in.gdal --ui ticket but it is more a general
decision how to advertise and make available custom dialogs if
available. I think that this needs to be offered by the parser along
with a new (standardized) flag. Or a g.gui.* wrapper?

Markus