iOS: is it possible to limit or filter items, gathered into the ReferenceNativeSymbol.items ?

[ni4]

I have some iOS extension .csproj, which makes use of some .NET assembly. This assembly is multi-platform and made in the way that it has a lot of predefined P/Invoke imported functions so only subset of those is used, depending on platform. However, toolchain detects all of them, making building on iOS impossible due to missing exports of native iOS library, paired with .NET one. Is there a good way to filter out items via some parameters in .csproj or any other good way?
Thanks.
P.S. I'm building directly on the Mac, -building from Windows via Mac pairing seems to work fine-.
P.P.S. Building from Windows also doesn't work, it was just mislooked false positive.