How enrichment works?

[AleVirtanen]

I have been trying to figure out how enrichment works as you select it for textfield in structor. Do I need to add my data in contained with this kind of data? I probably don't have that how extension should work.
{
resourceType: 'Patient',
name: [
{
use: 'official',
family: LastName,
given: [firstName]
}
],
// Add other fields as necessary
}

Now I don't get any value to this example item:
"item": [
{
"linkId": "d994a124-0423-4418-e7bc-83618a11873b",
"type": "string",
"text": "Test field",
"required": false,
"extension": [
{
"url": "http://ehelse.no/fhir/StructureDefinition/sdf-fhirpath",
"valueString": "Patient.name.where(use = 'official').family"
}
],
"readOnly": true
}
]

[kennethmyhra]

This was answered here: helsenorge/refero#158 (comment)