I am trying to add relations to contacts, however I am having issues adding custom relations, I can gather the information of these custom relations using the sdk using the 

1. .get_relatedlist_records(api_name)
   

method,

however when trying to add a relation to a record I can only specify the module of the relation, not the specific related list I want the junctionRecord to be stored under.

For an example, I have no issue linking contacts to campaigns under the default relation, however when I try to link the same contact to another contact through the custom relation "references" I am unsure how to proceed.

Is it possible to set some property of this junction record, in order for the relation to be stored in the appropriate custom relation?