This should give some information from a google timeline “takeout” block. To get one, you go to “Google Takeout” and “deselect all” then reselect just the Location History. Start the export, wait until it’s generated, and download the resulting Zip file. Then, extract the zip file and get the json file you want to process.
Note that this is PURELY a local javascript running in your browser – none of this JSON data is sent anywhere, it’s just calculated in your browser.