Render Field Item

Any idea how to solve this?

I'm having the same issue, the viewField and viewFieldItem are not generated.
From the doco, it seems pretty straightforward: https://graphql-core-schema.netlify.app/schema-extensions/render-field-i...
This could be handy when some modules with special fields provide custom formatters, in order to repeat the logic.
I noticed both fields appear in the Validate tab of the graphql server (eg. /admin/config/graphql/servers/manage/graphql/validate), under "Resolvers without schema".
Is anyone able to point out where the issue lies?

Same problem, could not find the issue, yet.