Looks like you’re using cases as choices. That’ll store the CaseID into the field. if you’re looking for a more meaningful piece of information than that to be part of the data download, you’ll likely need to create a hidden value that does an xpath query similar to the one used to populate the multiple-choice question, but with an added concat function to concat the names of those cases for example or any other case property.
Alternatively, if you don’t want to mess around with your app too much, you could just leverage something called “Relationships” in Excel, where you link the data in this field to the caseID in the cases sheet. this way, you can create pivot tables and pull the data from both places at the same time. if you have more than one value in that field, you would likely need to do some manipulation to make sure that each row contains only one value
last option is if you have a database software like MS Access or MSSQL server or anything like that, where you would just define the relationships, and you would create a view or a query that would show you the data from both tables.