originate a call with text to speech message

I use the Asterisk-Manager package for NodeJs

https://www.npmjs.com/package/asterisk-manager

and have a tape announcement as a text which must be translated via text to speech. When I try to call an outgoing phonenumber how can I setup the text to speech variable and the recipient? An example would be

ami.action({
    'action': 'originate',
    '??? phonenumber ???': '12345',
    '??? text to be spoken ???': 'Hello, this is a tape announcement'
  }, (err, res) => {
    if (err) {
        throw err;
    }

    console.log('everything was fine');
  });

from originate a call with text to speech message