Load your Attune tuning onto a compatible DSP dongle. It applies to everything your phone or Mac plays, including streaming, because the dongle EQs the decoded audio at the output.
Qudelix-5K works today, confirmed on hardware. FiiO, Walkplay/KTMicro and Moondrop are recognised, but their handlers are not ported yet, so Send stops and says so rather than half-writing a tuning.
Paste the ParametricEq.txt you exported from Attune (or load the file).
Exporting from Attune needs Attune Pro. Any AutoEq-format
ParametricEq.txt works here though, including files from AutoEq or squig.link.