What is the name of the custom field for custom link?

  • What is the name of the custom field for custom link?

    book_review_title
    book_review_author
    book_review_cover_url
    book_review_genre

    etc. is working but

    book_review_custom_links
    ook_review_custom_link_urls,

    and etc. not working?

    I tried it but I could not find it.

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