Read Sharepoint Designer Workflow variables from JSOM Code

Hi All,

I am Sharepoint 2013 Designer workflow. Here I am saving some values inside Workflow variables.

Using custom pages approval are happening.

Now, from one of the custom page I wanted to read the current context workflow variable. I have task ID to update the task status using the custom page. 

How can we get the current context of the workflow using task ID?

How can we read the workflow variables from the JSOM code.

Your help is much appreciated!!!

Thanks!!!

Krishnasandeep