I have a form and I need to call a method from a placeholder and also from other types of html attribute.

Is there anyways I can call a vue method?
Here is what I am trying to do

<input type=text class=form-control v-model=user.userName 

 placeholder=t(un) required> // want to call method t() from the placeholder

It seems this method cannot be called this way. Is there any other ways to achieve this?

And my method is

methods: {

   t(key){

        console.log(key)

        var local='fr';

        return this.trans(key,local);

      }

}