This TRRS cable works, have it with both the Macmini headphone jack and this USB-C dongle (https://www.amazon.com/gp/product/B097NGL6MM /ref =ppx_yo_dt_b_asin_title_o03_s01?ie=UTF8&psc=1) Check out my review of this dongle, it's decent USB-C audio up to 24b/96k.
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