They do have a 3.5mm jack, but Apple dropped the dedicated Stereo Line In jack like Chat Link is designed for jack around a decade ago. Chat Link connects to a line level output such as headphone or speaker jacks at the source, and thus pulls stereo audio at line level voltage by default.
The standard TRRS jack on modern macs and laptops does Headset or Headphone. It has 4 contacts - one for left, right, ground and mic. As it only has a single pin on the connector for a mic feed, so doesn't take stereo input which can be an issue. There's also a risk of audio distortion feeding line level voltage sources into a mic voltage level input - though you can mitigate this by keeping the volume low usually (and if it is still a problemm get a line level attenurator such as you'd see on a DSLR to take a line level source, to drop it down more).
So you can still try to use the TRRS jack on a mac, but there can be extra steps.
Eg. Some TRRS jacks may take a mic feed direct, but because of the different number of connectors between a TRS connector like a mic or Chat Link, most will need you to run it through a adapter so TRRS first to line the connections up in the right spots (eg sleeve on a TRS plug is generally ground, but on a TRRS plug it's the mic, and ground is the next contact down. Basically to get around that, get a headset breakout splitter and plug things into the mic side to make sure it all goes to the mic contact in the plug.
As you're feeding to a mono mic connection you should also switch your source audio to mono to make sure you don't just wind up loosing an audio channel (or you can use a TRS stereo to TS mono adapter - some headset breakout splitters might even do this on their own, but it's not something I'd bank on).
So yes, the mic has an AUX jack, but it's not a Stereo Line In which can result in headaches like losing stereo when trying to use a Chat Link with it. If you're okay with that, go for it though.



