Dynamic variables in twigs

In the form, I dynamically define the fields in the controller. Then in TWIG

I would like to use form_widget

to output the fields.

The usual approach when knowing the fields looks like below:

{{ form_widget(form.field1) }}

      

        
        
        
      

    

In this case, we cannot know if we will have in advance field1

, field2

etc. Although we have the field names in a variable named key

.

So what we would like to achieve is replace hardcoded field1

with something dynamic.