message: feat: implement the method for POST /app/form/fields.json
diff: @@ -22,4 +22,13 @@ export class AppClient {
  const path = `/k/v1${preview ? "/preview" : ""}/app/form/fields.json`;
  return this.client.get(path, { app, lang });
  }
  +
  + public async addFormFields(
  + app: AppID,
  + properties: object,
  + revision?: number
  + ): Promise<{ revision: string }> {
  + const path = "/k/v1/preview/app/form/fields.json";
  + return this.client.post(path, { app, properties, revision });
  + }
  }
  