I was unable to build the desktop application and didn't understand it well enough to add a new plugin on the desktop application.
So I improvised and used --ping-msg.
Made changes to the android application in order to parse ping messages starting with ::DIALER with another function.
I'm now sending information through to the android application by seperating arguments with ::

For example,
kdeconnect-cli -d f69e2e8ac00b140d --ping-msg "::DIALER::DIAL::9176119388"
*Will pop up a notification to dial the number 9176119388, which when clicked, opens a dialer*

kdeconnect-cli -d f69e2e8ac00b140d --ping-msg "::DIALER::ADD::Vishal::9176119388::0123456789"
*Will pop up a notification to add a contact Vishal (9176119388), which when clicked, opens the add contact screen on the user's phone.
This can be used to add upto three numbers in a single contacts.*
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Screenshot

More context :
I'm working on a project to create a Click-to-dial pop-up Dialer application for GSoC under Debian. This application (would be invoked as a MIME handler and) is being developed with Python3 & PyQt4. It can place a phone call with VoIP, display details about the country in which the phone number is registered, save the number to an address book.

With KDE-Connect‌, my aim is to send a phone number/contact to a user's mobile phone. This will show a notification on the Android device which the user can click to either dial (starting a dialer intent) or add to his contacts.