Yes this is possible.
STEP 1:
Ubunutu supports Remote Desktop sessions by default.
Visit this page https://help.ubuntu.com/stable/ubuntu-help/sharing-desktop.html.de to install GNOME Remote Desktop first on your Ubuntu machine.
Follow the instruction and enable Remote Desktop Support in the Ubuntu settings. Enable the "Enable Legacy VNC Protocol" and set the switch "Remote Control" to enable.
The remote desktop access via VNC clients is now already available via <Ubuntu machine IP address>:5900
STEP 2:
Install the noVNC function that turns VNC based protocol sessions into html5 sessions made for web browsers
Use the following command on your Ubuntu machine
sudo apt install novnc
STEP 3:
For a test start the noVNC function manually with
sudo /usr/share/novnc/utils/launch.sh --vnc 127.0.0.1:5900
STEP 4:
Start a web browser session from a different machine with
http://<<Ubuntu machine IP address>:6080/vnc.html
STEP 5:
Login with the password
STEP 6:
Enable the "Remote Control" function for your Ubuntu device in netFIELD Cloud
Configure the "Remote Control Settings" of your Ubuntu device as follows:
host = 127.0.0.1
http port = 6080