Welcome @ak94,
Beside the jr:choice-name function Stephane mentioned,
see https://getodk.github.io/xforms-spec/#fn:jr:choice-name,
also the selected-at may contribute to your solution.
See https://getodk.github.io/xforms-spec/#fn:selected-at
Here is example with both elements (but more complex as repeat inside repeat) https://community.kobotoolbox.org/uploads/short-url/9P9fJJrStEihs9kY0zuQ5Fkv338.xlsx
Here is an example with skip (instead of loop:
https://forum-kobotoolbox-org.s3.dualstack.us-east-1.amazonaws.com/original/1X/2aa0126e033cd2f4593ef5f604ddd241aa0cd750.xls)
