wp-calypso/client/blocks/plugins-scheduled-updates-multisite/hooks/use-prepare-sites-tooltip-info.tsx

import { createInterpolateElement } from '@wordpress/element';
import type { SiteDetails } from '@automattic/data-stores';

export function usePrepareSitesTooltipInfo() {
	const prepareSitesTooltipInfo = ( sites: SiteDetails[] ) => {
		const siteList = sites.map( ( site: SiteDetails ) => site.title ).join( '<br />' );

		return createInterpolateElement( `<div>${ siteList }</div>`, {
			div: <div className="tooltip--selected-plugins" />,
			br: <br />,
		} );
	};

	return {
		prepareSitesTooltipInfo,
	};
}