Additional fields in me

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Hi everyone,
I’m using strapi latest with sqlite or Postgres (when deployed) and node 16x. for my project.

I’m trying to add fields in the “me” response via graphql query, but it is not working.

Let say I’ve added a “fullname” field in my user collection.
I’ve added a custom function in my extension folder to get my datas.

When I use Postman to query this route localhost:1337/api/users/me I get all the datas in the collection.
When I use graphql playground, I can’t see this field.
I don’t know what to do to get my additional fields.

I’m searching for two days, and I did not find any clue.
Thank to you for your help