How to generate federation v2 compatible schemas via gradle in 6.x ?

[roookeee]

I am getting the following error when using federation v2 annotations during my gradle build:

Execution failed for task ':graphqlGenerateSDL'.
> There was a failure while executing work items
   > A failure occurred while executing com.expediagroup.graphql.plugin.gradle.actions.GenerateSDLAction
      > Attempting to use Federation v2 shareable directive while generating Federation v1 compatible schema

I had no luck finding a property to set the opt in flag for the gradle plugin action. How do I allow the Gradle action to generate a federation v2 schema? I checked all actions and think its an oversight as its settable e.g. in the Spring server in 6.x.

I know the default will change in 7.x, but that version is still in alpha. Having the ability to override the opt in for the gradle task would be an improvement regardless.