remote schema stitching with another language server

[maxstue]

Hi

I have a question for a custom scalar converter and schema stitching. I want to stitch a schema from a thirdparty Server and from my own server.
But the other server uses Java and a "BigDecimal" Type.
And when I load the schema in "banana cake pop" or any other UI tool (postman, insomnia) I get the following error on the server:

• "1. Unable to resolve type reference BigDecimal. (HotChocolate.Types.ObjectType)".

I have written my own Scalar (like so, or so) BigDecimal type and it is visible in the schema but it isn't used for the BigDecimal Scalar from the thirdparty server - no constructor is beeing called from the custom scalar.

Is there a way to allow or overwrite thirdparty Scalars so I can use them in .net ?
Is it even possoble to have custom types wich comes from other graphql services ? I couldn' find anything to it on the internet.

Thanks and Best Regards in advance 🙂