QT Vs RPC JSON 2.0

[Hergo]

Hello,
After reading the different subjects (Little) on JSON RPC 2.0 with QT:

http://mbroadst.blogspot.de/2012/03/qjsonrpc-round-2.html
https://wiki.qt.io/Qt_and_Web_Services

I wonder if anyone knows the solution. It appears this is not implemented natively in QT (Last).

There are servers, such as home automation, which uses a web service in JSON RPC 2.0. : https://www.jeedom.fr/wiki/index.php?title=API_JSONRPC_2.0

So I'd like , as "client", to connect to these servers in javascript HTTP (With or not Librairy JS or other in QT).
I can not use the socket and this the only available library (QJSONRPC) in C ++ is.

I have no problem with classic "web service".
If someone just help me?

Thanks.
FMU