I would like a plugin that could copy an object in game via /copypos1 /copypos2 and convert it into a Bo2 or Schematic file
You could try my world editing plugin: https://github.com/Sandertv/BlockSniper/tree/Version-1.1.0 The copy works different than most other copy pastes, because you have to look at the bottom center block, and type the command /clone copy <radiusXheight>. If you want to save a schematic, or a template as I called in that plugin, you can do /clone template <radiusXheight> <name>. You can then paste the copy with /paste copy, or the template with /paste template <name>.