Plugin: lifecycle hook to enable prettifying queries on load

Would it possible to auto prettify (**opt-in, off by default**) GraphGL calls when opening them in a GraphiQL window? I know there's a button in the UI to do this, but I would prefer to have this done as soon as a GraphQL URL is opened, so the extra button click is not needed. Perhaps this can be configured by setting an options object on the `graphiql` field? So instead of `graphiql: true` one could set `graphiql: { autoPrettify: true }` when for example setting up a `express-graphql` server.