GraphQL plugin is not loading environment variables from .env file

[arkandias]

I'm using GraphQL plugin (243.22562.13) in WebStorm 2024.3.1.1.

Here is my graphql.config.yml file (in project root):

schema: schema.graphql
extensions:
  endpoints:
    dev:
      url: ${ENDPOINT}
documents: "**/*.graphql"

And here is my .env file (in project root):

ENDPOINT=http://localhost:8090/v1/graphql

Yet the plugin does not replace ${ENDPOINT} with its value from .env.
I can edit it in the "GraphQL Environment Variables" dialog that I can open by clicking on the "Edit Environment Variables" button in the plugin toolbar, but it should be loaded automatically from the .env file (according to the doc).