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Use the Dynamic Event type to load event action with this.data.

This option can be used as a hook for different tool such as APEX Office Print.
Minimal example :

this.data 
{   progress:{ 
      name:"J_UC_WAIT_N_SECONDS_JOB"
  }
}

Best fit :

this.data 
{   progress:{ 
      name:"J_UC_WAIT_N_SECONDS_JOB",
      displayName:"Download 60sec"
  }, 
  style:{
      textLocation:"inline",
      textPosition:"left",
      textTemplate:"%0 %1 od %2%",
      completeText:"<a href=\"https://www.plug-ins-pro.com\">Download %0</a>"
  },
  time:30
}