Format Worker prompt. Multi variable Problem

[umangkalavadiya]

Suppose I want to create a story based on 2 variables in it.

1. Title 2. Main character.
   I have formatted prompt values and attached {{question}} to the title, and {{char}} to the Main character in the worker prompt.

I have enabled the override config and promptValues under the Worker.

This is my payload:
{ "question": "Heaven in the shell", "overrideConfig": { "promptValues":{ "char": "Krishna the god" } } }

I am getting some random story without the main character inclusion. How to resolve this.