No, the DJI Mic Mini is not compatible with the Insta360 Ace Pro 2.
DJI Mic Mini's wired outputs are USB-C and 3.5mm TRS. Insta360 Ace Pro 2 has no native 3.5mm or wired mic port -- confirmed via Insta360's own manual (Mic Cap covers only the built-in microphone). DJI's OsmoAudio direct-connect ecosystem is proprietary to DJI's own camera lineup and does not list Insta360 cameras.
What works instead
See all compatible microphone for the DJI Mic Mini →“Removing or installing the Wind Guard and Mic Cap does not affect the camera's waterproofing.”
“DJI Mic Mini Camera Audio Cable (3.5mm TRS) × 1 DJI Mic Mini Mobile Phone Adapter (Type-C) × 1”
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Confidence: high confidence