Angular: how to get input value without ng-model

I have form with dynamic inserted input to the DOM (from some other plugin). Is there way to read value from this input without ng-model on it?

<form name="myForm" data-my-directive>
    <div class="customPlugin">
        <!-- here input without ng-modeal appears: -->
        [ <input type="text" name="foo" value="bar" /> ]
    </div>
</form>

I look at many examples, but everywhere people writes about ng-model... :(