Populating repeating group with conditionals based on 2 get calls

Hi all,

I struggling to display bank transactional data based category. Am using the tink api which has separate get calls for transactions by item and transactions by category. Both these json data are linked by categoryid.
In a repeating group, I can only seem to display data from the transaction call or category call but cannot combine them - ie “show category name when category id = transaction id”.
Has anyone worked with a similar situation? Any help will be greatly appreciated!

Thanks for reading!