Fetch balance values from Fast Formulas

I have a requirement to fetch balance values based on input balance names passed to Fast Formula. I am using Balance Specific DBI's to fetch their values. When I hardcode balance DBI's, I get the correct output as YTD Sum. But when I pull the DBI names via UDT, change_context does not work and it returns me DBI name instead of DBI value.

Has anyone faced this? Is there a workaround for this?