All joysticks are configurated as "standard joystick" for dolphin.
For playing games with "only" wiimote support, you have to mapping the joystick to an emulated wiimote.
Enter a game, and then Press ALT+TAB on keyboard. That makes the dolphin window appear, and then F10. Only keyboard it can be used (although there's a mouse, you can't see it)...then, follow the instructions from the link (it's in spanish, but options are pointed on english. You'll get it)
https://www.elotrolado.net/hilo_wii-en-batocera-configurar-pad_2327259
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Also, you can enter configurations for dolphin, PCSX2, PPSSPP and retroarch from shortcuts when you press F1 and then select "Applications" on the file browser...i guess that's even more easy.