No, the DJI Mic 2 is not compatible with the Insta360 Ace Pro 2.
DJI Mic 2's wired outputs are USB-C, Lightning, and 3.5mm TRS -- all designed to plug into a port. Insta360 Ace Pro 2 has no native 3.5mm or wired mic port on the body itself (confirmed via Insta360's own manual -- the Mic Cap covers only the built-in microphone, not a port). DJI's OsmoAudio direct-connect ecosystem is proprietary to DJI's own camera lineup and does not list Insta360 cameras, so Mic 2's wireless transmitter mode doesn't apply here either.
What works instead
See all compatible microphone for the DJI Mic 2 →“Removing or installing the Wind Guard and Mic Cap does not affect the camera's waterproofing.”
“Mic 2 supports USB-C and Lightning outputs, as well as 3.5mm TRS analog output. It is compatible with most cameras, smartphones, and computers.”
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Confidence: high confidence