Below is the command to get the MongoDB Atlas information
mongo "mongodb+srv://<<clustername>>.mongodb.net/" -u <<username>> -p <<password>> --quiet --norc getMongoData.js > getMongoData-output.json
The username and password are the project owner.
Able to get the information when uploaded to Heracles Sizing Tool.
The caveat needs to install mongo shell 4.4 into the computer.