PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX schema: <https://schema.org/>

INSERT { ?s rdfs:label ?label . }
WHERE {
  ?s a <http://example.org/migrants/person> .
  ?s schema:givenName ?fn .
  ?s schema:familyName ?ln .
  BIND(CONCAT(STR(?fn), " ", STR(?ln)) AS ?label)
}