I have a created a custom attribute that is currently returning the Update - Timestamp as requested, but would like to only see the first or earliest result.
IF ([Comment present] = TRUE
AND [Comment public] = TRUE
AND [Updater role] != "End-user")
THEN [Update - Timestamp]
ENDIF
Many results will have multiple updates in them like this.

I know you are able to FILTER results, but is there any way to make it so that the calculation itself only returns a single result?