Paid app ($4.99) — only Google Play can deliver it
Bluetooth joystick, keyboard pairing utility for Wear OS.
Bluetooth Pair for Wear OS — description
The Bluetooth pairing utility on the Galaxy Watch running Wear OS does not support pairing the watch with a joystick, gamepad, or keyboard. However, this utility enables you to pair your smartwatch with game controllers, allowing you to use a joystick for playing games on your smartwatch.
* Works with Android 8-13 * Works with Wear OS * Works with Android phone, tablet * Works with Android TV & Google TV * Required permissions: fine location, bluetooth scan, bluetooth connect