Hello Abin 1218,
Thanks for reaching Microsoft Community. We understand how important this set up for you on your device. We'll do our best to help.
Surface Laptop 4 has a 3.5mm headphone jack where you can try plugging in your external microphone on it. Once plugged in, select your microphone as Recording device. Try these steps below:
- Open Control Panel > Hardware and Sound > Sound
- Go to Recording tab, then select your microphone and Set as default.
- Click Apply then OK.
Otherwise, please check How to set up and test microphones in Windows (microsoft.com).
I hope this helps. Feel free to respond on this thread to keep us posted.
Best regards,
StevenK