Hi vivek soni,
To consume webservices in your jive add-on app, you can try jive connects.
Jive connects is a facility given by jive to access any third party apis with several auth options that service might be expecting.
check this --> Accessing data via Jive Connects API
Also check one example we used it in this repo by my team mate Siddhartha --> jive-content-manager/categoryManager.js at master · siddharthadeshpande89/jive-content-manager · GitHub
While this code calls jive connects for a service which again calls jive, we have other apps where we use jive connects to call services like google apis and others.
For tiles, there is no facility like jive connects.
But instead you can have your third party web service configured in the middleware which serves the tile, and push external data to the tile using jive-sdk.
Hope that helps.