Open the image in Google Drive, click “share” and set general access to “anyone with the link”
Copy the link to the clipboard
Extract the file ID: https://drive.google.com/file/d/1eU7GZ-Ir6QBDrR4UqFI32AqLjXrFNvLW/view?usp=sharing
Becomes: 1eU7GZ-Ir6QBDrR4UqFI32AqLjXrFNvLW
Finally, insert the file ID in this link: https://lh3.googleusercontent.com/d/<file ID>
So in the example above: https://lh3.googleusercontent.com/d/1eU7GZ-Ir6QBDrR4UqFI32AqLjXrFNvLW