Is there no way to query subitems?

You can but you must get the subitem board ID first, then use item_page on THAT board, rather than the main board ID.

You can get the subitem board ID from

{
 boards(id: 123123){
   columns(ids: "subitems") {
     settings_str
   }
 }
}

settings_str is a JSON string you can parse, and there is a boardId property (or boardIds) which contains the subitem board ID.

This query tends to be the easiest to get the ID.

Now you can query that subitem board as if it was a regular board.

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