How to link to specific part of a page in wordpress permalinks

Maybe this works, currently not tested. Only a idea to enhance for the custom var.
Also I don’t the goal right.

add_filter( 'query_vars', 'add_custom_query_var' );
function add_custom_query_var( $vars ) {

  $vars[] = '#';
  return $vars;
}

A other hint is the link to the codex, to filter the rewrite of WP.

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