@Catija The OP can only do it indirectly by flagging it for moderator attention and asking for it to be migrated, which was the case with this one (assuming you're talking about
this one). Unfortunately, in cases like this the asker still has the last word. As to who migrated it specifically, you should be able to see that as part of the migration notice (but any of the moderators would (or should) have done the same).