Ansible 2.9.6 (at the time of writing this is the latest available for Leap
15.2) has a broken nmcli modules, thus it's impossible to handle remote
servers. 
The error I get is the following: 

================
An exception occurred during task execution. To see the full traceback, use
-vvv. The error was: ValueError: Namespace NMClient not available
fatal: [server.example.com] FAILED! => changed=false 
  msg: Failed to import the required Python library (NetworkManager glib API)
on peter.home's Python /usr/bin/python. Please read module documentation and
install in the appropriate location. If the required library is installed, but
Ansible is using the wrong Python interpreter, please consult the documentation
on ansible_python_interpreter
================

Apart from this serious issue, the documentation in the module page is outdated
for Leap 15.2 since the required packages are not available anymore.