Roam Research datalog query for references not already placed on a specific page

roam-unlinked-references-query.js

let container = "Tree of knowledge";
let tag = "zettel";

let ancestorrule=`[ 
   [(ancestor ?child ?parent) 
    [?parent :block/children ?child]]
   [(ancestor ?child ?a) 
    [?parent :block/children ?child] 
    (ancestor ?parent ?a)]
]`;

let blocks = window.roamAlphaAPI.q(`
[:find ?page_title
  :in $ % ?container_title ?tag_text
  :where 
    [?container_page :node/title ?container_title]
    [?page :node/title ?page_title]
    (ancestor ?tagged_block ?page)
    [?tagged_block :block/refs ?tag_page]
    [?tag_page :node/title ?tag_text]
    (not (ancestor ?container_block ?container_page)
         [?container_block :block/refs ?page])
]`, ancestorrule, container, tag)

console.log(blocks.map((data, index) => {return `[[${data[0]}]]`}).join('\n'));