Use a value as WKT from Global:Custom text (rewritten as combination of two fields)

Hello,

I have a latitute value in one field and longtitute value in another field of my view. I am combining those values in a Global:Custom text, by rewritting it and using replacement patterns.

But when I select Global field as the WKT field in the OpenLayers Data Overlay settings, then looking at the preview, the result is not rendered. Instead it only shows the replacement pattern in the wkt part of the code:

'wkt' => '[field_route]',

Instead it should be like:

'wkt' => 'POINT (30.656986906656 39.136861296311)',

Here is the entire output:

  0 => 
  array (
    'projection' => '4326',
    'attributes' => 
    array (
      'title_rendered' => '<a href="/mdb/content/ttttttttttttttttttt">ttttttttttttttttttt</a>',
      'title' => 'ttttttttttttttttttt',
      'field_geolocation_rendered' => '',
      'field_geolocation' => NULL,
      'field_geolocation_1_rendered' => '',
      'field_geolocation_1' => NULL,
      'field_route_rendered' => 'POINT (30.656986906656 39.136861296311)',
      'field_route' => 'POINT (30.656986906656 39.136861296311)',
      'nothing_1_rendered' => 'POINT (30.656986906656 39.136861296311)',
      'nothing_1' => '[field_route]',
      'name' => '<a href="/mdb/content/ttttttttttttttttttt">ttttttttttttttttttt</a>',
      'description' => '<a href="/mdb/content/ttttttttttttttttttt">ttttttttttttttttttt</a>',
    ),
    'wkt' => '[field_route]',
  ),

What can I do to use the rewritten value instead of replacement pattern here?

Thanks...