不可能.

您可以使用CSOM来完成

you can do it using CSOM

https://social.msdn.microsoft.com/Forums/office/zh-CN/6a0d0448-d86b-4b99-97b3-c052d46cbec5/adding-user-as-site-collection-administrator-for-my-site -via-csomrest?forum = sharepointdevelopment

https://social.msdn.microsoft.com/Forums/office/en-US/6a0d0448-d86b-4b99-97b3-c052d46cbec5/adding-user-as-site-collection-administrator-for-my-site-via-csomrest?forum=sharepointdevelopment