[ISSUE] Integrations Playground not working

[taprile314]

Hey team! This library looks awesome, thanks for your good work!!!
Lately I'm researching for tools that helps me configure and organize workflows in a easy and accesible manner.
However, I was trying to use the playground for a little bit of experimentation and didn't get it to work.

Describe the issue
I tried to use one of the usecases described in the source code but when I click on execute, i receive a template error message

To Reproduce

Used this yaml workflow

steps:
  - name: unsupported
    condition: $not(op in ["+", "-", "*", "/"])
    template: |
      $doThrow("unsupported operation")
  - name: add
    description: Do addition
    condition: op = "+"
    template: |
      ( a + b )
  - name: subtract
    description: Do subtraction
    condition: op = "-"
    template: |
      ( a - b )
  - name: multiply
    description: Do multiplication
    condition: op = "*"
    template: |
      ( a * b )
  - name: divide
    description: Do division
    condition: op = "/"
    template: |
      ( 
        $assert( b != 0, "division by zero is not allowed");
        a / b 
      )

with this input data:

{
  "a": 10,
  "b": 2,
  "op": "+"
}

and this bindings:

const bindings = {
  "description": "Enter your bindings here"
};

but i'm receiving this error output:

{
  "error": "op is not defined"
}

So, i think the template isn't recognizing my input json

Expected behavior
I think the output should look something like this ¿? I'm not really sure

{
  "outputs": { 
    "add": 12
  }
}

Screenshots
If applicable, add screenshots to help explain your problem.

Required information (please complete the following information):

• Package version: The one that is using the playground https://transformers-workflow-engine.rudderstack.com/#/workflow-engine

Additional context
Add any other context about the problem here.