Mixer headphone out to iPhone lightning

I would like to use the headphone out of my mixer to input to my iPhone 8. I was shooting one of those knob twisting videos and of course the audio sucked. I was staring at the headphone out which I never use and wondered how to get that to a lightning connector…
thanks!

As you get any analog signal into a digital form: by using an audio interface like a IK Multimedia iRig Pro I/O or Audient iD4 or many others.

Just google it with keywords: ios audio interface lightning