I want to make blend surface in GH

I want to make G2 blend surface in GH. but there is no direct way to make it.iI found that, in the’C# script’, there’s is command: ‘Rhino. Geometry. Brep. CreatBlendSurface’ may be useful. but here is a new peoblem: there are 3 types of variables can’t be defined , they are: 'BrepFace ','BrepEdge 'and
‘Blendcontinuiry’. so could
you fix it or figure out how to make G2 continue surface in GH. Thank you!