how to create and save a note in the sub-folder to “Notes” folder from outlook.com account

There is a folder "Notes" in http://outlook.com/ account. If we save any note from the browser while on http://outlook.com/ account, the note is saved in the folder "Notes" on the http://outlook.com/ account. This "Notes" folder is visible on the web when you login to the http://outlook.com/ account.
However if we create a sub-folder to the "Notes" folder of an http://outlook.com/ account on a web browser, I am unable to create a note in that sub-folder while on the web browser. This sub-folder is also invisible to any apps connecting to the outlook.com and using services of mail, contacts, notes, etc.

The only Microsoft support document available on this subject, does not mention anything about sub-folder to "Notes" folder. Link given below.

https://support.microsoft.com/en-us/office/create-edit-and-view-sticky-notes-in-outlook-com-or-outlook-on-the-web-d9ee4b90-96cf-4d56-b622-ceed8e4f6b10

My question is: how to create and save a note in the sub-folder to “Notes” folder from http://outlook.com/ account.