title: Is possible to make the options of properties dynamic in business template editor of WSO2?
body: <p>Context: 
  in Wso2, to make Siddhi apps dynamic, one uses business rules. 
  This business rules are created from templates like this: 
  <a href="https://i.stack.imgur.com/9iUSO.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9iUSO.png" alt="enter image description here"></a></p>
  
  <p>Rule templates have some properties for each attribute. In this properties there are <strong>options</strong> to make a list of possible values for attributes. 
  What I wonder is how to make these options dynamic, like calling from an external API or from the DB. </p>
  
  <p><a href="https://i.stack.imgur.com/evRQT.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/evRQT.png" alt="enter image description here"></a></p>