How can I declare a dependency for Binary Project Specification dependencies?

I have A.xcframework which depends on B.xcframework. Both are prebuilt.

I wrote a spec file so that my consumers could consume A:
```json
{
"1.0.0": "https://raw.githubusercontent.com/A/a/1.0.0/A.xcframework.zip"
}
```
But the thing is, A needs B and I would like to declare this dependency - and I was wondering, how could I do that?

I want my consumers of A to also download B.