[json] add IJSONSchemaSnippet.bodyText. Fixes #16212

src/vs/base/common/jsonSchema.ts

@@ -52,5 +52,6 @@ export interface IJSONSchemaMap {
 export interface IJSONSchemaSnippet {
 	label?: string;
 	description?: string;
-	body: any;
+	body?: any; // a object that will be JSON stringified
+	bodyText?: string; // an already stringified JSON object that can contain new lines (\n) and tabs (\t)
 }