Any plans for a 1.12.2 version since that is a common version due to some mods being stuck on that version as of right now. I noticed you have back to 1.14.4 so i thought i would ask

1.12.2 is pre The Flattening which bluemap heavily relies on.
No plans to backport the newer versions.

The latest BlueMap version that supported minecraft 1.12.2 was 1.5.5.
But beware: its very old, and no longer supported in any way.