MongoDB: Unique combined index for array values & other fields

I have a collection where i need to have a unique item of arrays.
The items represents a SSDP matching. E.g:

{
    "_id":"63271ed8e47cf61cb98732c4",
    "headers":[
        "gwid.phoscon.de"
    ],
    "nt":"urn:schemas-upnp-org:device:basic:1",
    "description":"Phoscon Gateway",
    "timestamps":{
        "created":1663508184610,
        "updated":null,
        "announced":null
    },
    "usn": null
}

Now when i add a another dataset, with the same header values & nt + usn value, the driver should throw a duplicate key error (11000).

Only when the three criterias / values are the same in the new dataset it shuld throw the duplicate key error. Similiar to this question: Mongodb unique array values combination index .When one value does differ, it should be added to the collection.

How can i do this?

I tried to set a unique index to "usn" & "nt", but this does not work. Default value for "usn" is null, so when no "usn" is set, only one item can be added to the database.

Something like this:

collection.createIndex({
    "headers":1,
    "usn":1,
    "nt":1
},{
    "unique":true
});

But the example above does not care for the array values. As soon as "usn" or "nt" allready exists, the result it duplicate key error.

I need a "combined" unique index for the the three fields "headers", "nt" & "usn".

Is that possible?