How can I get schema from graphql?

I have a field

There are values inside SignificanceLevelType :

How can I get these values in frontend if there aren’t a special query for this?

When I sent:
query { protectedNaturalAreas { edges { node { significanceLevel } } } }

I got significanceLevels in protectedNaturalAreas, but I want to get existing areas (‘FEDERAL’, ‘LOCAL’, ‘REGIONAL’)

`{
  "data": {
    "protectedNaturalAreas": {
      "edges": [
        {
          "node": {
            "significanceLevel": "FEDERAL"
          }
        },
        {
          "node": {
            "significanceLevel": "REGIONAL"
          }
        },
        {
          "node": {
            "significanceLevel": "REGIONAL"
          }
        }
      ]
    }
  }
}`

I use Apollo and Vue3