You can display an additional step in the Website Booking Plugin that will allow your clients to choose a lesson format between Online or In-Person lessons.
Enabling the Online/In-Person Setting
Click on "Account & Settings" and then click on "Integrations & Add-ons".
Click on "Settings" under the Website Booking Plugin.
Click on "Advanced Settings" at the top.
Check the "Enable Online/In-Person" box.
Specify the locations you'd like to use for In-Person lessons and Online lessons and update the labels if you'd like.
Click on "Save"
NOTE: You must have either the Teacher Location Links Add-on or the Lessonspace Integration enabled for this setting to be accessed.
Usage
When a client clicks on the "Book Lesson" button, they'll be directed to the second step where they'll be prompted to select between an Online or In-Person location for their lesson, as depicted in the image below: