The application does not allow this at the moment. It currently does not accept any parameters. It might be possible to add such a feature in the future though.
By "text message" I assume that you mean the message body. I think that the message body, in the general case, can be too large to be effectively passed as a parameter.
But what might be feasible is to store it in a particular directory, using the message-id as the file name. The difficulty is that the message body is not generally available without streaming the message, which requires async operations that can be difficult to handle. But I will see what I can do for the next release.