none internet recipe source (imported from)

[Silther]

Is your feature request related to a problem? Please describe.

currently you can only link a webpage as the source of a recipe (imported from) not an cooking book.

Describe the solution you'd like

Would be nice if could save the cooking book you got the recipe from and some infos about it.
or at least make "imported from" only act as an link if it saves a working url.

Describe alternatives you've considered

No response

Additional context

No response