If you want to Install MongoDB Drive on WHM server you can follow these steps;
1. Open Module Installers
Software > Module Installers

2. Open PHP PECL module

3. Install mongodb Module
3.1. Select your target PHP Version

3.2. Find a “PHP PECL” Search: mongodb and Install

This process will take some time, wait patiently, and then you should see like screen;

Congrats, you did it!