ADF pipeline get dynamic count of input parameters - json

Question

I have a pipeline where I want to pass a JSON to from 3rd party application.
simple JSON Example, but the keys could be different for each call
{
"name": "Here is a name",
"guaid": "123456-123456-123456-111112",
"owner": "my.email#example.com",
"description": "here comes my description"
}
Passing the JSON is not the problem but I do not want to configure each parameter in the JSON as an pipeline parameter inside my ADF because it is not needed.
I do not modify the JSON inside my pipeline, I just have to surround it with some other parameters, so I need it as a whole.
I cloud of course define a parameter for each key in the JSON and concatenate it again but why do the effort if it is not needed.
I also can not modify how the JSON will be passed to my pipeline, so it is not possible to pass the whole JSON inside one parameter like this:
{
"inputParam": "{\"name\": \"Here is a name\",\"guaid\": \"123456-123456-123456-111112\",\"owner\": \"my.email#example.com\",\"description\":\"here comes my description\"}"
}
so is it possible to get all input without "knowing" it and use it in my activity?
My Pipeline is just simple, I only need a set variable and web activities, so I want to avoid a complex solution.
JSON Outbutt should look like this
{
"processingMode": "full",
"version": "1.0.0",
"content": [
{
"type": "Application",
"id": "akjhajf-ffsfsfs-sf-sf-sf",
"data": {
"name": "Here is a name",
"guaid": "123456-123456-123456-111112",
"owner": "my.email#example.com",
"description": "here comes my description"
}
}
]
}
I achieve this by adding this in a set variable like this with the not allowed method i mentioned above
{
"processingMode": "full",
"version": "1.0.0",
"content": [
{
"type": "Application",
"id": "#{guid()}",
"data": #{pipeline().parameters.inputParam}
}
]
}
I then just use this result JSON and call a external Webservice via Web activity