Sharepoint REST API - post comment on behalf of another user - sharepoint-online

Question

There is a way of how to add comments to Sharepoint site using REST API. It is explained here https://beaucameron.com/2021/01/18/add-comments-to-sharepoint-list-items-using-the-rest-api/ for example.
But when I add comment like this, it adds it on behalf of my name - because REST endpoint is accessed using access token, which is linked to my e-mail.
I'd like to migrate comments from one site to the other, and keep original authors.
Is there a way to post comments on behalf of other users?
I tried this POST body:
{
"__metadata": {
"type": "Microsoft.SharePoint.Comments.comment"
},
"text": "Some new comment",
"author": {
"__metadata": {
"type": "SP.Sharing.Principal"
},
"email": "AlexW#OnMicrosoft.com",
"id": 18,
"loginName": "i:0#.f|membership|alexw#onmicrosoft.com",
"name": "Alex Wilber",
"principalType": 1
}
}
But still, comment is posted on behalf of my name. The response is like the following:
{
"d": {
"__metadata": {
"id": "https://sharepoint.com/_api/web/lists('017dd808-5a37-4d65-89f9-b5ce994554b4')/GetItemById(1)/Comments(15)",
"uri": "https://sharepoint.com/_api/web/lists('017dd808-5a37-4d65-89f9-b5ce994554b4')/GetItemById(1)/Comments(15)",
"type": "Microsoft.SharePoint.Comments.comment"
},
"likedBy": {
"__deferred": {
"uri": "https://sharepoint.com/_api/web/lists('017dd808-5a37-4d65-89f9-b5ce994554b4')/GetItemById(1)/Comments(15)/likedBy"
}
},
"replies": {
"__deferred": {
"uri": "https://sharepoint.com/_api/web/lists('017dd808-5a37-4d65-89f9-b5ce994554b4')/GetItemById(1)/Comments(15)/replies"
}
},
"author": {
"__metadata": {
"type": "SP.Sharing.Principal"
},
"email": "myName.mySurname#onmicrosoft.com",
"expiration": null,
"id": 12,
"isActive": true,
"isExternal": false,
"jobTitle": null,
"loginName": "i:0#.f|membership|myName.mySurname#onmicrosoft.com",
"name": "myName mySurname",
"principalType": 1,
"userId": null,
"userPrincipalName": null
},
"createdDate": "2022-05-24T08:40:19.0841947Z",
"id": "15",
"isLikedByUser": false,
"isReply": false,
"itemId": 1,
"likeCount": 0,
"listId": "017dd808-5a37-4d65-89f9-b5ce994554b4",
"mentions": null,
"parentId": "0",
"replyCount": 0,
"text": "Some new comment"
}
}
So still, I'm the author of the comment...