Portal and previous gen maps migration

is there a website or irc channel/discord or anything on where people who work specifically on BF6 portal and migrating maps from previous battlefield series?

sometimes i bump into a code and i enter that somewhere in bf6 and it takes me to the custom map.

i just tried out golmud railway other day and at first i was like what is this? this isnt even close.

about after 5 minutes of gameplay i seen it was like golmud railway.

i was very imrpressed.

anyhow i want to try more maps like these and talk to the people who make them and provide feedback if i try the maps.

where would that be?