I got a 3.5mm to USB-C adapter so that I can plug an external microphone into my 2021 Razer Blade 15 Advanced, but it's only detecting output, rather than a mic input.
Amazon.com: Headset Y Splitter Audio Cable Separate Microphone Headphone Port Gaming Headset Splitter PC Headphone Adapter Cord for Razer Kraken X/BlackShark V2 Pro/Razer Nari : Video Games
Competitive Gaming Headset - Razer Kraken
Razer 7.1 Adapter 3.5mm to usb, Computers & Tech, Parts & Accessories, Cables & Adaptors on Carousell