Few people have been asking over discord, I found a method to do this. I thought it would be no harm posting it here. There ya go fellas.
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Tutorial made for Google Chrome, you need to mess up yourself with the Dev Tools in case you use any other browser.
Don't worry its easy af :
• Open the map page you want to decode.
• Download the .pb2map file. (we don't really need the .pb2map, just need to download it to load it up into the LocalStorage of your browser)
• Hit up the F12 Key on your keyboard, it will open up the Developer Tools.
• Go to applications tab, collapse the LocalStorage folder and search for your map ID. (Video Tutorial)
There you go, you can find a XML-like parameter-ized file over there, you may save it in your computer using notepad. If you want to edit it, you may, needs a few tweaks though :
• Edit the code in the same window you downloaded it from.
• Download the .pb2map and re-upload it.
Although its useless, but since it was demanded, there you go!