Instead of manually typing the reference name, it would be extremely useful if it could be allowed to generate the string into the curved brackets using a formula. In the same way it would useful also using Summary sheet fields in it.
Example:
=INDEX(COLLECT({Sheet1_Name}, {Status}, "Enrolled"), 1)
could be
=INDEX(COLLECT(("{Sheet"+[Sheet number]#+"_Name}"), {Status}, "Enrolled"), 1)
or
=INDEX(COLLECT((JOIN(Ref1:Ref3),""), {Status}, "Enrolled"), 1)
where Ref1 Ref2 Ref3 contain the part of the string to build.