Create new issue with custom fields using REST API

Hello,

Is it possible to create a new issue using REST API that contains CustomFields. We are running YouTrack 2018.4

This is what we came with so far with no luck :

{
   "project":{
      "id":"0-16"
   },
   "summary":"REST API lets you create issues!",
   "description":"Let's create a new issue using YouTrack's REST API.",
   "fields": [
        {
            "projectCustomField": {
                "field": {
                    "name": "State",
                    "id": "50-3",
                    "$type": "jetbrains.charisma.customfields.rest.CustomField"
                },
                "$type": "jetbrains.charisma.customfields.complex.state.StateProjectCustomField"
            },
            "value": {
                "name": "Submitted",
                "id": "60-0",
                "$type": "jetbrains.charisma.customfields.complex.state.StateBundleElement"
            },
            "id": "82-44",
            "$type": "jetbrains.charisma.customfields.complex.state.StateIssueCustomField"
        }
    ]
}

Thanks in advance

Regards