USB-C implies Android—Wavelet is an EQ app that works with all music players and you can add bass & dampen treble to your heart’s content. Some apps like Spotify also have a basic EQ built into them.

Dongles aren’t supposed to alter the sound profile, and even if they did it is of limited usefulness if the effect is something that can’t be tweaked at all. It’s just DSP at the end of the day, there’s no benefit to doing it blindly in the dongle rather than via a controlled EQ setting.