Custom permalink structure for individual page

Hello,

Here is what I’m trying to achieve:

I have an existing page [mysite.com/my-page](https://mysite.com/my-page)

I would like to add another page called new-page but I would like to access this page by visiting [mysite.com/my-page/new-page](https://mysite.com/my-page/new-page). I don’t want to change the structure of the permalinks sitewide. This would be a one-time use thing just for the new-page specifically.

Is this possible and how might I go about it?