I developed an extension which is better than others. You can configure copyright banner content, detect existing copyright blocks that shifted down in the file and move it to the head, specify folder and file extensions, add custom parameters to the copyright block etc...

Extension: https://marketplace.visualstudio.com/items?itemName=emirbugra.copyright-fixer

Source code: https://github.com/kodmanyagha/copyright-fixer

Please don't hesitate to create issue on the repo. I will be happy to handle your requirements. Happy coding brothers/sisters.