Add Font Family in Typography

Yes, use this code in your functions.php

function filter_ot_recognized_font_families( $array, $field_id ) {

  /* only run the filter when the field ID is my_google_fonts_headings */
  if ( $field_id == 'my_google_fonts_headings' ) {
    $array = array(
      'sans-serif'    => 'sans-serif',
      'open-sans'     => '"Open Sans", sans-serif',
      'droid-sans'    => '"Droid Sans", sans-serif'
    );
  }

  return $array;

}
add_filter( 'ot_recognized_font_families', 'filter_ot_recognized_font_families', 10, 2 );