On most Garmin watches, you can add whatever sport you wish. Check out your user manual - an example for the Forerunner 735XT is here: https://www8.garmin.com/manuals/webhelp/forerunner735/EN-US/GUID-6D055816-2C05-49F5-8BE7-B4E0A7C09570.html
On watches supporting the ConnectIQ technology you can find a plugin in the ConnectIQ store for almost any sport you can imagine. And if you can't, you can write one yourself, or hire someone to do it.
Also have a look at this similar thread about badminton: https://forums.garmin.com/apps-software/mobile-apps-web/f/garmin-connect-mobile-andriod/204741/badminton