This extensions adds the $GLOBALS['TSFE']
and the \TYPO3\CMS\Core\Page\PageRenderer object to the template context and handles the tsfe manipulation.
So you can access the Page properties like this:
{{ tsfe.page.title }}
Sets the title tag for the current page.
{{ tsfePagetitle(tsfe.indexedDocTitle ~ ' | News: ' ~ news.title) }}
This way you can add a JavaScript file.
{{ pageRenderer.addJsFooterLibrary(
'googleApi', 'https://maps.googleapis.com/maps/api/js?sensor=false',
'text/javascript', false, false, '', true, '|', true
) }}