Booleans using metaballs in geometry nodes

Hola community, I'm trying to use geometry nodes to do a difference boolean operation, taking a metaball mesh animation away from a normal mesh. My node setup works fine if I subtract a normal mesh from a normal mesh, but subtracting a metaball mesh from a normal mesh results in the boolean operation doing nothing. Is there another node I need to add to convert a metaball mesh to a normal mesh? Am I missing something else?

Many thanks for any help you guys can offer!