Overpass query without key

Hello, I wish to run an overpass query to find all elements that contain a specific value regardless of the key they’re associated to.
I’m searching quite specific values, thus I do not expect a large number of matches.
I tried running *=value and stuff similar to that but the query always fails.
Is there some way to run such a query?

Overpass API/Overpass QL - OpenStreetMap Wiki has some explanation on the Overpass QL syntax.

A minimum example for nodes with value “Foo” in the current bounding box would be:

out meta;

You could update query above for letter case insignificant (add ,i)

out meta;
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