Launch OFFS form inside plugin

Summary:

In OFFSC plugin, I am trying to launch OFFSC forms from plugin, for that I am referring official ofs forms ad plugin documentation. OFS form is launching from plugin but form content is not showing. their is no error also observed. below is the method I am using OFFSC post message: 

this.send({
      "apiVersion": 1,
      "method": "close",
      "backScreen": "open_form",
      "backFormLabel": formLabel,
      "backActivityID": parseInt(this.activity.aid)

    });

 

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