Contact Form 7 adds trailing slashes to JSON

I want the form data from Contact Form 7 plugin form to be sent to 3rd party CRM. I’m working on the API Integration tab.
I enter the following (suggested by CRM): Input Type: JSON & Method: POST, and enter the JSON template.
When I click save, it automatically adds trailing slashes to JSON template. So, “provider_id”: 50 becomes \”provider_id\”: 50.
If I click save again, it adds more trailing slashes. It becomes \\\”provider_id\\\”: 50.
I don’t know what to do. Please, suggest how to remove the trailing slashes & how to stop them from adding by itself when I click Save button.!