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Adding code similar to the following to the postflight() function within the script file will update `#__extensions` with the required parameters:

   function postflight($type, $parent)
   {
       // $parent is the class calling this method
       // $type is the type of change (install, update or discover_install)
   
       if ($type == 'install') {
           $db = JFactory::getDBO();
           $query = $db->getQuery(true);
           $query->update($db->quoteName('#__extensions'));
           $defaults = '{"param1":"value1","param2":"value2"}'; // JSON format for the parameters
           $query->set($db->quoteName('params') . ' = ' . $db->quote($defaults));
           $query->where$db->quoteName('name') . ' = ' . $db->quote('com_XXX')); // com_XXX is your component 
           $db->setQuery($query);
           $db->query();
       } 
   }