Rearrange Menu order alphabetically by navigation label for big sites

I hope someone could help me on this.

I need to order my menu alphabetically (ascending) by navigation label but not by using ‘drag and drop’. Let me explain,

I have a blog of about 500 pages. At Appearance > menus>‘View All’ the list was arranged alphabetically by title. I created a menu from the list that was arranged alphabetically by title. I added labels to each menu. Now I have to arrange the menu alphabetically by navigation label. ‘Drag and drop’ is ok but it is a nightmare with 500 pages. Is there a way to order the menu alphabetically by navigation label?

I must also mention that all my pages are at the same level, i.e., no child pages.

Would really appreciate guidance on this.

Bob