How can I list all supported architectures of a package by apt command?

I need to download stress-ng deb package from a PC, and then copy it to an offline arm board. So, I tried apt download stress-ng:arm64, and get: Error: Unable to locate package stress-ng:arm64. Then I guess maybe stress-ng isn't packaged for arm64, so I want to get a list of architectures supported by stress-ng. But how? I found some 3rd-party packages can achieve this. But what's about apt? Shouldn't apt support this feature if missing?