Question: how to set up many-to-many relationships in the schema?

Hi, we are trying to build our multi-study data dictionary based on the dcf generic data dictionary.  I think _terms.yaml let you do one-to-many mapping, but we also need to set up many-to-many mapping as well (e.g. each variable has many tags, and each tag is linked to many variables). Do you have any suggestions on how to achieve that under the current dcf framework? Thanks.