Then, click in "Add (+) -> From Docker, Vargrant, etc"
The next screen you have to set the proper image. If we want to use the PHP Version 7.3 we need to fill the image
byjg/php:7.3-cli. Make sure you have docker installed and properly setup in the PHPStorm IDE. If you can't see the "Server"
docker, click in "New" and after setup continue the process as you can see below:
If everything is OK you can see the PHP Version and XDebug. You can deselect the option "Visible only for this project" if you want to have these configurations for all PHP projects you have.
And voilá. Just select this new version to your project, and you can have auto-complete, debug, etc. as if you have the PHP installed in your machine
You can repeat this process for any PHP version you want.