Association for Http Task in CMMN

We can configure a human task t2 to be triggered on completion of a previous human task t1 using entry criterion on t2 and association connected to t1.
But how we can achieve this on completion of a http task. I’m trying to achieve this.
On completing http task, human task t1 should be triggered.
But i’m not able to add an association to the http task in the UI.
When i try to add it explicitly in the model xml, its working.
Is this functionality left out intentionally in the UI?