That is not possible. A DAC (digital to analog converter) must receive a digital signal, it cannot process an analog signal. In order for a dongle DAC to process an analog signal from the phone, it would need to contain an ADC and a DAC, and I'm not aware of any dongle that does.
I'm extremely happy with my LG G8 ThinQ. It sounds miles better than my wife's Samsung S9, and the LG's internal Quad DAC sounds better than my XTremPro X1 dongle DAC, both using UAPP. According to Darko, LG phones are comparable in sound quality to an iPhone with Dragonfly Red. https://darko.audio/2018/06/the-dap-days-are-over-part-3-lg-v30/
I plan to keep the G8 for several years. Hopefully by then someone else will step up and provide another audiophile phone. I will never buy into Apple's closed world.
I’ve told him that several times, even in private messages. He still thinks he’s right. So don’t waste your time.
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