dockerのクロスアーキテクチャサポートを有効にする WSL2の場合、「sudo apt install qemu-user-static」とするだけ。
docker run --rm -it arm64v8/alpine:latest
http://dl-cdn.alpinelinux.org/alpine/edge/main
http://dl-cdn.alpinelinux.org/alpine/edge/community
http://dl-cdn.alpinelinux.org/alpine/edge/testing
apk add -u python3-dev py3-pip py3-numpy py3-opengl py3-matplotlib py3-pygame py3-scipy py3-scikit-build
apk add gcc g++ musl-dev zlib-dev
git clone --recursive https://github.com/opencv/opencv-python
cd opencv-python
python3 setup.py bdist_wheel