Multi-select field via API

Hi,

I'm trying to create a ticket via /api/v2/requests, using a specific form which has a multi-select dropdown field.

So far I've not been able to figure out how I can insert values into this field.
I've tried with (following the docs):

"custom_field_options": [
      {"name": "Displayname of field", "value": "tag value"},
      {"name": "Displayname of field", "value": "tag value2"}
    ]

"ticket_field": {
"custom_field_options": [
{"name": "Displayname of field", "value": "tag value"},
{"name": "Displayname of field", "value": "tag value2"}
]
}

Any ideas?