https://github.com/openwrt/luci/pull/4307#issuecomment-699573997
When I followed your link I found this.
Is this the way we later want LuCI to write the VLAN code when 21.02 release is done?
Since my primary goal right now is to get my config script file (with UCI code) ready before the service release of 21.02, then this will absolutely be good enough for me right now.
Now when my rig has become more and more complex and the knowledge has grown how to config then LuCI falls a little short for me to use as primary setup. But once configured LuCI is a great tool to see the config result and overview and to make small config adjustments.
I don’t think I really has time right now to dig in how to compile firmware so I think I hold short on that solution for now.