Multiple external JSON files to a single Postman collection

Hi All, I’m trying to run a Postman collection with an external JSON file. but now I found out there are another set of values I need to pass in a separate JSON file because those values in the second JSON file is completely different from the values to the first JSON file. is there a way to submit two different JSON files to a single Collection? or is there a workaround for that? like merging those two JSON files to one JSON file and read the values in the Pre-Req. and assign a variable (global / environment) and pass that to the request payload?

JSON 1 file values : value A , value B
JSON 2 file values: value C , value D