RecordProxy: how to access fields with complex arguments?

_This is somehow similar to https://github.com/facebook/relay/issues/3065 but it's not really the same._

Hi, we have a `count` field on a connection which accepts complex arguments like so:

```graphql
count(legacyFilter: LeadsLegacyFilter): Int

# input LeadsLegacyFilter {
# labels: [ID!]
# owners: [ID!]
# sources: [ID!]
# status: ALL | ARCHIVED | ...
# }
```

Now, let's say we want to update the `count` number for status `ALL` no matter what labels or other parts of the filter are set (notice the filter fields are all optional). A typical use-case would be a deletion of the record(s) => decrease counter. Here is the issue - the count field is internally stored like so:

```text
count(legacyFilter:{"status":"ALL"})
count(legacyFilter:{"labels":[],"owners":[],"sources":[],"status":"ALL"})
count(legacyFilter:{"labels":["abcdef"],"owners":[],"sources":[],"status":"ALL"})

// ... any other possible combination ∞
```

❓How can I access these fields easily considering `RecordProxy.(get|set)Value` works with explicit arguments and doesn't return the fields unless I know the args in advance?

I'd like to acknowledge that this is a poorly designed GraphQL schema and we have to fix it, however, this issue directly translates to any other field with complex args.