Passing contexts

There seems no way to pass contexts via this library to the actual detectIntent call. Value in this is if you want to maintain context over a long period of time (where Dialogflow would timeout).

Could the constructor and related function definitions not be changed to include this along lines of:

//add additional input variable below
constructRequest(text, sessionPath, payload, prevContexts) {
return {
session: sessionPath,
queryInput: {
text: {
text: text,
languageCode: 'en'
}
},
queryParams: {
payload: payload,
// Add context to queryParams
contexts: prevContexts
}
};
}