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  • My current solution is to monkey patch the acf.select2 object with the following code:

    // Enable markup in ACF options
    acf.select2.decode_data = function( data ) {
      // bail ealry if no data
      if( !data ) return [];
      $.each(data, function(k, v){
        // text
        data[ k ].text = v.text; // HERE IS THE CHANGE
        // children
        if( typeof v.children !== 'undefined' ) {
          data[ k ].children = acf.select2.decode_data(v.children);
      // return
      return data;

    But I think that there should be some filter for the decode_data as my solution is not (and can’t be) future proof.