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No warning is necessary, but you can annotate these observations as dead. People who don’t want to see dead organisms can filter them out then. There’s a feature request for a photo blur (declined) that has lots of discussion about issues around this: https://forum.inaturalist.org/t/implement-photo-blur-on-observations-annotated-as-dead/21214 I will note that you shouldn’t add a text based photo with a warning.
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There’s some threads that discuss this issue, including https://forum.inaturalist.org/t/feral-cats-extremely-under-documented-in-inat/21667 I personally think that barn cats are something of a gray area - I could see some barn cats being clearly wild in their behavior, others being more “captive”. If they stay in around the barn as shelter pretty exclusively, get food and regular medical care from an owner, I’d lean towards captive. But if they really just get food and then wander and do their own thing all over the place, that seems like a feral cat to me and I’d call “wild”. If you feel like an individual cat should clearly be one or the other, you can leave your reasons in the notes/comments and preemptively tick thumbs up or down for “is wild” in the DQA.