Setting labels doesn't cause metadata to appear anywhere--it just changes the labels.
You do have to have always_login:true for FFF to collect bookmark info.
However, you also have to tell FFF where you want it to go. To put it in the title page inside the book, you can do:
add_to_extra_titlepage_entries:bookmarks,bookmarke d,bookmarktags,bookmarksummary
If you want it in a custom column, you'll need to create the column(s) and set the values using custom_columns_settings.
I don't remember what is collected in the bookmark entries, so I don't know what would be appropriate.
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