[1.12] Is there a way to generate an NBT structure relative to the middle of the structure, rather than the corner?

[naturaGodhead]

I recently found out how to generate structures using structure blocks and the nbt files it creates. I noticed it begins generating on the position relative to where the corner structure block was, though and that creates floating structures on hills. Is there a way to start generating from the middle instead? (Bottom of the structure, not center)