UPDATED:
Experimenting with a new approach:
<input class="form-check-input deflog-check" type="checkbox" ngTrueValue = "1" ngFalseValue = "0" ng-value="chk_mail">
Now trying to retrieve the value in AngularJS like so:
object2Edit.notification = Number($scope.chk_mail) + Number($scope.chk_mail)
;
However, $scope.chk_mail returns as NaN.