hvn.json

{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "type": "object",
    "patternProperties": {
      "^[a-zA-Z0-9_]+$": {
        "type": "object",
        "properties": {
          "_ask": { "type": "string" },
          "value": {},
          "_description": { "type": "string" }
        },
        "required": ["_ask", "value", "_description"],
        "additionalProperties": false
      }
    },
    "additionalProperties": false
  }