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Unfortunately I have not - I've spent several hours trying a few different approaches, but still no luck.  Here's another screenshot of the built-in Adobe filter letting a user know that input can be bar-delimited

rss1_0-1638886297556.png

The query that builds the predefined filter (highly unusual that it is not visible)

rss1_1-1638886382745.png

And then an expanded snippet of the built-in Adobe filter's XML.  It's quite odd, there appears to be no mention in here about using the bar delimiter outside of the "help" prompt.  Which is making me think that perhaps the delimiter for this specific filter is being set in a package.

  <container type="visibleGroup" visibleIf="[/tmp/@behaviorType]='open' or [/tmp/@behaviorType]='click'">
    <input label="Filter by URL label" type="edit" xpath="/tmp/@urlFilter"/>
    <static label="You can specify more than one labels by using '|' (pipe) as a separator."
            type="help"/>
  </container>

If you have any tips or avenues of research to recreating this feature outside of this specific filter, let me know!