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If you’re able to save the value, I believe you can get the value in the “acf/fields/relationship/query” hook like this:
$args['meta_query'] = array( array( 'key' => 'custom_acf_field', 'value' => get_field("custom_field_name", "option"), 'compare' => 'LIKE' ) );
You can also save it as the current post/page custom field by providing the ID instead of “option” for the update_field() and get_field() functions.
I hope this helps.
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