How to allow uploading additional file extensions in WordPress

wordpress-additional-files.php

<?php
add_filter( 'upload_mimes', 'my_myme_types', 1, 1 );
function my_myme_types( $mime_types ) {
  $mime_types['svg'] = 'image/svg+xml';     // Adding .svg extension
  $mime_types['json'] = 'application/json'; // Adding .json extension
  
  unset( $mime_types['xls'] );  // Remove .xls extension
  unset( $mime_types['xlsx'] ); // Remove .xlsx extension
  
  return $mime_types;
}