[screenshots]Turn the nuclei to capture a picture

[vkusrorof]

I want to get more screenshots to explain how the nuclei in the validation process, I learned that the official - headless (#2021), but no more integrated into the existing yaml guidance, If I want to set a fixed-point screenshot (similar to burpsuite's "Repeater" module) in the style of the screenshot at the request step, for example:
http:

raw:
|
POST /vuln HTTP/1.1
Host: {{Hostname}}

echo vuln_screenshot >> 1.txt

{{Set the screenshot request and response content here 1}}
|
GET /1.txt HTTP/1.1
Host: {{Hostname}}

{{Set the screenshot request and response content here 2}}