I wouldn't worry about the loading as much as the lateral stability of the hanger - in other words, the frame. A porch swing can anchor into the ceiling joists. You'll be in a free-standing frame. You may be a subdued swinger, but the kids will be going for height at some point. You'll want a lot stronger frame with a wider leg angle than the one in your original picture.
Might consider tying it to a tree (overhead branch?) for safety.
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