Audio input to Mac mini from analog 3.5mm jack.
I'm trying to input audio from a analog cassette deck, VECTOR RESEARCH stereo cassette deck VCX-450 with a 3.5mm adapter cable, into a 2020 Mac mini. The deck has an high end stereo mic connected to it with sound through capabilities. The mini only has one 3.5mm opening which is for headphones, output only. I've looked online at several lightning / USB headphone cables but from I can tell they will not work. I'm trying to salvage the high end mic with some kind of work around but not having much luck. This system worked really well before when I had a 2010 Mac that had a separate audio input opening. I was able to input the audio, (voice over), and edit with Audacity.
Any help would be great, Thanks.
Mac mini, macOS 12.5