Microsoft Graph API mail office 365: Is any option create inbox message NOT as Draft?

I'm using office 365 mail Microsoft Graph API , trying to create new message following the Doc:

https://developer.microsoft.com/en-us/graph/docs/api-reference/beta/api/user_post_messages

POST https://graph.microsoft.com/beta/me/messages
Content-type: application/json

{
    "subject":"Did you see last night's game?",
    "importance":"Low",
    "body":{
        "contentType":"HTML",
        "content":"They were <b>awesome</b>!"
    },
    "toRecipients":[
        {
            "emailAddress":{
                "address":"AdeleV@contoso.onmicrosoft.com"
            }
        }
    ]
}

{ OUTPUT:

"@odata.context":"https://graph.microsoft.com/beta/$metadata#users('ad787b4f-1fda-4523-8e48-ffedb7f4635f')/messages/$entity",
"@odata.etag":"W/\"CQAAABYAAAAmXr9SsE/UR4PcnTZcg7qWAAAFS12t\"",
"id":"AAMkAGRWAAAFSmKXAAA=",
"createdDateTime":"2017-12-23T07:29:57Z",
"lastModifiedDateTime":"2017-12-23T07:29:58Z",
"changeKey":"CQAAABYAAAAmXr9SsE/UR4PcnTZcg7qWAAAFS12t",
"categories":[

],
"receivedDateTime":"2017-12-23T07:29:58Z",
"sentDateTime":"2017-12-23T07:29:58Z",
"hasAttachments":false,
"internetMessageId":"<MWHPR130@MWHPR130.namprd13.prod.outlook.com>",
"subject":"Did you see last night's game?",
"bodyPreview":"They were awesome!",
"importance":"low",
"parentFolderId":"AAMkAGRWAAAAAAEPAAA=",
"conversationId":"AAQkAGRVYAsRJrRdc_mWNaxU=",
"conversationIndex":"AQHTe7/VAniOJVgCxEmtF1z6ZY1rFQ==",
"isDeliveryReceiptRequested":false,
"isReadReceiptRequested":false,
"isRead":true,

       "isDraft":true,

"webLink":"https://outlook.office365.com/owa/?ItemID=AAMkAGRWAAAFSmKXAAA%3D&exvsurl=1&viewmodel=ReadMessageItem",
"inferenceClassification":"focused",
"unsubscribeData":[

],

The output that I'm seeing is Draft message created in by inbox.

I tried to post with "isDraft":false , but the result unfortunately the same :(

Basically my purpose is "Restore" the original inbox messages , it means create them in Inbox without sending....I Did it with EWS , now trying to convert into graph api

So, Is Any option to create mail not as Draft ?

P.S: like in EWS https://msdn.microsoft.com/en-us/library/ms527503(v=exchg.10).aspx

Thanks a lot

The final solution as @David mentioned is via Extended properties:

acording to:

https://developer.microsoft.com/en-us/graph/docs/api-reference/beta/api/singlevaluelegacyextendedproperty_post_singlevalueextendedproperties

and :

https://msdn.microsoft.com/en-us/office/office365/api/extended-properties-rest-operations

https://msdn.microsoft.com/en-us/library/ee218129(v=exchg.80).aspx

  "singleValueExtendedProperties": [
      {
         "id":"Integer 0x0E07",
         "value":"4"
      }
    ]
}