title: Graphql object ( or JSON) as filter argument
body: <p>Is it possible to have a JSON object as filed in filter arguments. Something like:</p>
  
  <pre><code>    Query{
        building(location:{lon,lat}){
          name,...
        }
      }
  </code></pre>
  
  <p>I need to pass location, and I would like to pass it as js object ( to apollo client) or as stringified JSON.</p>