get mount point nav

gistfile1.txt

page.5 {
  dataProcessing {
    70 = TYPO3\CMS\Frontend\DataProcessing\MenuProcessor
    70 {
      special = list
      special.value.stdWrap.cObject = CONTENT
      special.value.stdWrap.cObject {
        table = pages
        select {
          pidInList = root
          selectFields = uid
          where = is_siteroot = 1
        }

        renderObj = TEXT
        renderObj.value = {field:uid},
        renderObj.insertData = 1
      }

      titleField = nav_title // title
      as = rootPagesNavigation
    }

  }
 }