passing data from javascript variable to an ejs variable

i am getting a value in the variable items and this is in a script tag in html but i want to pass the data in the variable items to my back end to be used for storing in a db. i made selectedTeams a res.local.selectedTeams so i can use it in the ejs to try store the value of items and use it like that but it does not work

var transfer = $("#transfer1").transfer(settings1);
    // get selected items
    var items = transfer.getSelectedItems()
    console.log(items)
    for (let index = 0; index < items.length; index++) {
      <%= selectedTeams %>.push({_id: items[index].value})
    }


 res.locals.selectedTeams = []


router.post('/newseason', auth.adminAuth, async function(req, res, next) {
  console.log('..............................................................')
  console.log(selectedTeams)
});

so when the url gets called /newseason i would like the selected teams to be in the selected teams viariable