edit:findReplace

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Payload",
  "type": "object",
  "properties": {
    "sheet": {
      "type": "string"
    },
    "range": {
      "description": "The scope to search, the whole sheet's occupied footprint when absent.",
      "anyOf": [
        {
          "$ref": "#/$defs/CellRange"
        },
        {
          "type": "null"
        }
      ]
    },
    "query": {
      "type": "string"
    },
    "replacement": {
      "type": "string"
    },
    "matchCase": {
      "type": "boolean",
      "default": false
    },
    "useRegex": {
      "type": "boolean",
      "default": false
    },
    "matchEntireCell": {
      "type": "boolean",
      "default": false
    },
    "withinFormulas": {
      "type": "boolean",
      "default": false
    }
  },
  "required": [
    "sheet",
    "query",
    "replacement"
  ],
  "$defs": {
    "CellRange": {
      "description": "An inclusive rectangle. `from`/`to` may be equal, a single cell.",
      "type": "object",
      "properties": {
        "from": {
          "description": "Top-left cell, e.g. `\"A1\"`.",
          "type": "string"
        },
        "to": {
          "description": "Bottom-right cell, e.g. `\"B3\"`.",
          "type": "string"
        }
      },
      "required": [
        "from",
        "to"
      ]
    }
  }
}

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Output",
  "description": "This command's own extra result fields.",
  "type": "object",
  "properties": {
    "queryCompiled": {
      "description": "Whether `query` compiled as a regex, always `true` when `useRegex` is `false`, since the literal form is always `regex::escape`d before compiling, escaping cannot fail.",
      "type": "boolean"
    },
    "matched": {
      "description": "How many scope cells' search text matched, counted whether or not the match was eligible to be written back.",
      "type": "integer",
      "format": "uint",
      "minimum": 0
    }
  },
  "required": [
    "queryCompiled",
    "matched"
  ]
}