code: public function renderPath($filePath='', $tplData=[], $return=true, $isPage=false)
      {
          // Remove the start of the templates path, since Twig asks
          // for a path starting from one of the registered directories.
          $path = $this->normalizePath($filePath);
          $prefix = $this->templateDir . '/';
          if (strpos($path, $prefix) === 0) {
              $path = substr($path, strlen($prefix));
          }
  
          try {
              $content = $this->twig->render($path, $tplData);
          }
          catch (Twig_Error $err) {
              $content = $this->error($err, $isPage);
          }
  
          // Mimicking the API of Tpl::load and how it's called by
          // Kirby\Component\Template::render.
          if ($return) return $content;
          echo $content;
      }
docs: Render a Twig template from a file path,
  similarly to how Tpl::load renders a PHP template
  @param string $filePath
  @param array $tplData
  @param bool $return
  @param bool $isPage
  @return string
  @throws Twig_Error