The short answer is, no, we don't have this capability right now. It is something that could be theoretically added, but it would be hard for us to prioritize this right now.
If the purpose of this is to contract two tensors with different QNs, though, then one way you could do this is to just convert them both to dense, non-QN tensors and then contract them that way. (You may likely have to do some index replacement on one of them to get the id's to match before hand.)
Another way to go is just to use fewer QNs in the first place, so like the minimum amount shared by the two tensors. If you wanted to give a little more context, I might be able to help you more.