JSONB_CONTAINS : invalid token

[signmeuptwice]

Sorry but I can't find a proper example of the function for postgres running in symfony 7 and latest doctrine 3

I have a column location containing a JSONB like this:

{title:"blah blah", coordinates:..., etc ...}

I execute this query

        $qb = $this->createQueryBuilder('a');
        $qb = $qb->select('a.id', 'a.location');
        $qb = $qb->where("JSONB_CONTAINS(a.location, 'title') LIKE :loc0");
        $qb = $qb->setParameter('loc0', ' % blah% ');
        $query = $qb->getQuery();
        $result = $query->getResult();

error

                                                                                              
  SQLSTATE[22P02]: Invalid text representation: 7 ERROR:  invalid input syntax for type json  
  LINE 1: ...AS location_1 FROM post p0_ WHERE p0_.location @> 'title' LI...                  
                                                               ^                              
  DETAIL:  Token "title" is invalid.                                                          
  CONTEXT:  JSON data, line 1: title      

conf:

        dql:
            numeric_functions:
                rand: DoctrineExtensions\Query\Mysql\Rand
            string_functions:
                    JSONB_CONTAINS: Scienta\DoctrineJsonFunctions\Query\AST\Functions\Postgresql\JsonbContains