Normalizing/Denormalizing data on demand

Hi there 👋

let me provide some context:

we are using relay-runtime v12.0.0

Our environment implementation is similar to [this](https://github.com/vercel/next.js/blob/canary/examples/with-relay-modern/lib/relay.js)

The current call on the server looks like this, and we pass the data to the SSR-ed app via an element with an data-relay attribute
```js

const environment = initEnvironment({})

const queryProps = await fetchQuery_DEPRECATED(environment, Query, variables)
const initialRecords = environment.getStore().getSource().toJSON()

return {
queryProps,
initialRecords
}
```

now we've come to a situation where we need to use some of the data from that query on the server as well, but the data is normalized/masked and pretty hard to use outside react components.

I've tried to implement something like this:
```js
const environment = initEnvironment({})

const queryProps = await fetchQuery_DEPRECATED(environment, Query, variables)
const initialRecords = environment.getStore().getSource().toJSON()

const request = getRequest(Query)
const operation = createOperationDescriptor(request, variables)

const response = await environment.execute({ operation }).toPromise()
```

and yes, I get the response in an expected way, a simple graphql response but based on the duration of environment.execute (+100ms) it looks like it is doing a 2nd request instead of using the data obtained by fetchQuery. That extra time sadly isn't something that we can afford

I am wondering if something out of these 3 things are possible:
- there is a way to use just `environment.execute` and transform the normal graphql response into the needed initialRecords and queryProps?
- other way around: If there is way to get the standard graphql response by using initialRecords and queryProps?
- there is a way to make environment.execute use the data that is already fetched by fetchQuery?

Thank you