We have some basic FIND / REPLACE functions in GREL
If you can get your masterlist (ARRAY list) into a simple STRING form like so, then this GREL expression can work for you.
It will return -1 when it does not find a match
indexOf("[minute,hour,day,year,month]","year") --> 17
indexOf("[minute,hour,day,year,month]","second") --> -1
indexOf("Alabama,Arkansas,Colorado","Arkansas") --> 8
indexOf("Alabama,Arkansas,Colorado",cells["Column 1"].value) --> 8
indexOf("[Alabama,Arkansas,Colorado]",cells["Column 1"].value) --> 9