BES Relevance based on REST API query of BFI DB

I’m looking for a Relevance I can use to create a colon delimited Property, combining the BigFix Inventory ID and the BigFix Enterprise Computer ID.

I.e. Relevance statement: <REST API answer to a request for BFI’s Computer ID> & “:” & computer id

Unless someone can tell me how in BFI to create a custom column that combines these two properties within the report itself.

Heaven forbid BFEnterprise and BFIDB use the same unique identifer.

Thank you in advance.