SPARQL functions in CONSTRUCT/WHERE

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Yes this is possible

You can’t use expressions directly in a CONSTRUCT template but you can assign the variable in the WHERE clause either via a SELECT expression in a sub-query or using BIND.

In your case as GROUP_CONCAT is an aggregate it can only be a SELECT expression so you just need to put your entire SELECT as a sub-query e.g.

PREFIX dc: <http://purl.org/dc/elements/1.1/>    

CONSTRUCT
{
  <http://data.staatsarchiv-bs.ch/id/archivalresource/CH-000027-1/pa-633c-a-312-fasc-163> <http://fancyTitle> ?fancytitle
}
WHERE
{
  SELECT (group_concat(?title ; separator = " ") AS ?fancytitle) WHERE { 
    GRAPH ?graph {
      <http://data.staatsarchiv-bs.ch/id/archivalresource/CH-000027-1/pa-633c-a-312-fasc-163>  dc:relation+ ?relation .
      ?relation dc:title ?title .
    }
  }
}

The above works fine on your endpoint

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