Extracting reponse content for subsequent requests is very verbose, am I missing a convenience syntax?

[ppenguin]

Just wondering if there's no (much) more compact way to express the following:

# Get free
GET {{base}}/getmytoken

# @lang=lua
> {%
local body = vim.json.decode(response.body)
client.global.set("regtoken", body.regtoken)
%}

### test contents of response
POST https://httpbin.org/post HTTP/1
Content-Type: application/json

{
  "regtoken": "{{regtoken}}"
}

For that matter, I also tried without @lang=lua which, according to the spec, would default to javascript, but this didn't work, presumably because the lua env has no access to a js interpreter?

But anyway, I would expect there to be an automatic variable containing the last response which could be used directly?