Adaparter HTTP REST - adding Header option

[cdeom]

Currently I'm only able to give some parameters into the url:
https://xxxx.cloud/api/V2/datafetch?api_key=API-KEY&user_id=USER-KEY&datapoint_uuids=xxxxxx
but in more complex endpoints I need to send header information like

curl -X POST "https://xxxx.cloud/api/V2/datafetch" -H "Content-Type: application/json" -H "APIKEY: API-KEY" -H "USERID: USER-KEY" -d '{
"dates": ["now-2Y/Y", "now/Y"],
"sampling": ["day"],
"datapoint_uuids": ["xxxxx"]
}'

and I'm not able to do that, this feature is really useful for most of REST API