grafana/public/app/plugins/panel/news/module.tsx

import { isString } from 'lodash';
import { PanelPlugin } from '@grafana/data';
import { NewsPanel } from './NewsPanel';
import { NewsOptions } from './types';
import { DEFAULT_FEED_URL, PROXY_PREFIX } from './constants';

export const plugin = new PanelPlugin<NewsOptions>(NewsPanel).setPanelOptions(builder => {
  builder
    .addTextInput({
      path: 'feedUrl',
      name: 'URL',
      description: 'Only RSS feed formats are supported (not Atom).',
      settings: {
        placeholder: DEFAULT_FEED_URL,
      },
    })
    .addBooleanSwitch({
      path: 'useProxy',
      name: 'Use Proxy',
      description: 'If the feed is unable to connect, consider a CORS proxy',
      showIf: (currentConfig: NewsOptions) => {
        return isString(currentConfig.feedUrl) && !currentConfig.feedUrl.startsWith(PROXY_PREFIX);
      },
    });
});