Issue with .graphql files when switching project to nestjs

I had a project at which backend was written with GraphQL/lambdas. Now I want to convert whole project to NestJS/GraphQL.

The problem is as follows:

I have joined.graphql file in src/GraphQL folder and there is an import (usage) of this file in another .ts file. When I try to start the project with nest start command, none of *.graphql files are copied to dist folder. Then, that import throws an error as there is no joined.graphql file in the dist folder.

I tried to add nest-cli.json file with assets field to include ./**/*.graphql files as assets. According to the nestjs docs, now these files should also be copied. But they are not.

How can I proceed in this situation?