Create a subpage easily while writing text

Say I’m writing the following text in a page titled “My Diary”:
“Today I went to a new pub, called The Awesome Hamster’s, with Stan and Ali.”

I would like to be able to select “The Awesome Hamster” and have the option to create a new subpage titled “The Awesome Hamster” where I would immediately write details about this pub and paste some pics. Then I would go back to “My Diary” to write the rest of the story.

Currently it seems my only option is to create a new page, then type or paste its title, then make a link in “My Diary”. This breaks my editing flow and is more error-prone.

I think other software, such as Obsidian or Tiddlywiky, do support this, but Coda doesn’t. Or am I missing something?

The current situation:

What I would like: