When Jeff Bishop from Microsoft was a panelist at the 2022 ACB convention I did ask if the new natural voices might become available for third party screen readers. He said that they were only available for Narrator and I knew that attempting to try to get more information out of him by asking follow-up questions would probably be fruitless. This doesn’t mean we’ll never see them for other screen readers but it’s pretty clear to me that Microsoft has no immediate plans for this.