Retrieving reflection data for structs used in input signatures

I am writing a code generator based on D3D12 shader reflection data. Given a simple vertex shader:

struct VertexIn
{
    float3 mPos : POSITION;
    float3 mColor : COLOR;
};
struct VertexOut;  // layout unimportant to question

VertexOut VS(VertexIn vin) 
{ 
    // some math here, return a VertexOut
}

I can use ID3D12ShaderReflection::GetInputParameterDesc to get the type and semantic for each member of VertexIn, as well as the register it is mapped to. However, I would like to retrieve the names of the VertexIn members (i.e. "mPos" and "mColor") for my generated code. Is there a way to do this?

Start with the D3D12ShaderReflection::GetInputParameterDesc API and the sample HLSL structs in the issue, then trace how reflection records input members and names. Done means establishing whether mPos and mColor are exposed by the available reflection data, and documenting the limitation or identifying the relevant compiler metadata.