Azure Functions and Assembly compiled in CLR 2.0

This is a question I have. When I reference a legacy assembly in my azure function, I get the following error:

_Mixed mode assembly is built against version 'v2.0.50727' of the runtime and cannot be loaded in the 4.0 runtime without additional configuration information._

I do not have access to the source code but it seems to be a C++ assembly. Is it possible to reference C++ assemblies written in CLR 2.0? I believe there is already a similar request.