DEV: Add experimental json_scheme site setting type (#12226)

app/assets/javascripts/admin/addon/components/site-settings/string.js

@@ -0,0 +1,20 @@
+import { action } from "@ember/object";
+import Component from "@ember/component";
+import showModal from "discourse/lib/show-modal";
+
+export default Component.extend({
+  @action
+  launchJsonEditorModal() {
+    const schemaModal = showModal("json-schema-editor", {
+      model: {
+        value: this.value,
+        settingName: this.setting.setting,
+        jsonSchema: this.setting.json_schema,
+      },
+    });
+
+    schemaModal.set("onClose", () => {
+      this.set("value", schemaModal.model.value);
+    });
+  },
+});