Is there a way to run a script through Opencpu wit

Question

I am new to opencpu and I am trying this :

1. Create a script to load dataframe in memory (on server of course)
2. Give a method to query this dataframe through GET api.

Can this be done for a large dataframe to keep it loaded once? And can this be done without writing a R package (which is the only way I have found so far to access R scripts through opencpu)