HELP - Multi Select Drop Down and Data Organization


Need help formatting a multi select drop down to sort by list. For example, I have jobs which have multiple shifts options for each job. I currently have the shifts listed out in the multi select drop down to filter a map. The map works correctly, however the format is messy. It lists them in the following format [‘Days’, ‘Nights’, ‘Evenings’] with about 15 variations I want the multi select drop down to simply list an options for Days, Nights, Evenings, Flexible, Not stated and if there is Days in the list, automatically select all variations which Days is presented in the lists. Is this possible? Can anyone point me in the right direction of how to get this set up? Thank you
Screenshot 2023-06-22 at 2.08.52 PM
Goal: (I did this by using static options, but I need it them to be dynamic options that link to the jobs data I currently use to sort the map.