Howto write modules to storage?

Sometimes uploading is taking too long because you use larges modules like MQTT. Is there an easy way to save the loaded module to storage. So next time you uses mqtt = require("MQTTS").

s = require('Storage');
mqtt = require("MQTT");
print(Modules.getCached())
/* output
[ 
  "MQTT", 
  "Storage"
 ]
*/

// save cached module 
s.write("MQTTS", /* howto ?*/);