Polymer Method Binding

Not directly, but there are several ways to possibly achieve what you want. I assume you want to convert the data ...?

• Define the property as an ES5 getter

  A little cheating, but you can define the property as a getter and then wrap your own logic around the return value.

  <div>{{likes}}</div>
  
  Polymer('my-tag', {
    firstName: 'John',
    get likes() {
      return this.firstName + ' ' + lastName + ' likes bread';
    }
  });
  

  Demo: http://jsbin.com/nuyuqote/3/edit

  . . Object.observe(), , . . .

• : (

  <div>{{'thingy' | upperCaseFilter}}</div>
  
  Polymer('my-tag', {
    upperCaseFilter: function(value) {
      return value.toUpperCase();
    }
  });
  

  : http://jsbin.com/nuyuqote/1/edit

• <prop>Changed

  .

, , - {{someMethod()}} Polymer, - , JavaScript. -, - onclick="someMethod()", , XSS.