Is it possible to make the rule match only the outermost obj and not the ones inside it?

Is it possible to make the rule match only the outermost obj and not the ones inside it?, I read the ast-grep documentation, and it seems it can be achieved using stopBy. this is a playground of rule

expect: 2 match

// match 1
{
    a: 1,
    b: {
        c: 1
    }
}

// match 2
{
    d: 1,
    e: {
        f: 1
    },
    g: {
        h: 0
    }
}

You can use not + inside + stopBy: end.

• not: https://ast-grep.github.io/guide/rule-config/composite-rule.html#not
• inside: https://ast-grep.github.io/reference/rule.html#inside
• stopBy: https://ast-grep.github.io/guide/rule-config/relational-rule.html#stopby

rule:
  kind: object
  pattern: $A
  not:
    inside:
      kind: object
      stopBy: end

Example Playground