In your last Metadata you have a space between the colons dateread: :
I don’t use double colons in my frontmatter, but I just tested it and the space seems to break it.
Also in your last example you have three open square brackets cover::[[[
Could you send a screenshot of your note?
Because frontmatter generally needs to be framed by ---, e.g.
---
Titre:
author:
dateread:
---
I see in that example that there is a # title before the first --- but I can’t get that to work.
Maybe try removing the stuff before the actual metadata.
And finally, I’m not sure if I’m understanding your original post, but you have to have each of these books in their own note. I don’t think it works if you have multiple metadata blocks in one note, but that might be wrong. Either way, I find it easier to have each book have their own note.
Maybe you could try that?
Hope this helps 
Edit: I just remembered I uploaded a sample book vault a while ago. If you’re unfamiliar with Github, it might be easier to download it and look at it in Obsidian, but you can also look at it online. It could just give you an idea of what is possible.