Typescript, Map and filter of json help: 10 min work

This should take 10 min for a programmer with experience with map, pipe and filter operator. I have a NestJs/Express service, which takes in a group parameter as string. (JSON File and ScreenGrab attached) I dont want to return the entire JSON object. I want to map to the referenceListObjects array in the the attached json and filter on the group parameter passed in. 1 DocType can belong to 1 or more groups. If it belongs to more than 1 group, the groups will be separated by a colon. So it must split the group property on the colon and filter the group to see if the doctype belongs to it and return the doctypes belonging to a group. EXAMPLE of the web service call and json ATTACHED. So the data must be mapped to the referenceListObjects interface or class and return an array of doctypes belonging to the group. Just need the Typescript syntax for the map and filter and referenceListObjects interface or class. Need the code in a few hours