Understood. There is an API made for Neural Network purposes inside the engine that might be of use to you, though it’s usually used a bit differently from what I gather. Since it can use ONNX runtimes it may be applicable, though you’ll have to vet that claim as I’m mostly a layman to ML. Nico may know of better resources however!
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However I couldn’t find any resources on YOLO implementation with Unreal, it does seem that some users have done it, though their repo is undisclosed.
Here’s a Repo using YOLOv7 in C++ that could offer some inspiration, though it’s not built for Unreal Engine.