Need help to identify CNA for automation

[qatester]

I am trying to automate connecting to a captive network assistant (CNA). Once I change the ssid a popup appears (CNA) and asks the user to either click a button or fill in some details to get connected to wifi - this is not a web based portal, it is a native portal. Because it isn’t a website there aren’t any elements etc visible. I am ok with changing the ssid, but stuck on the cna side. Would anyone have any ideas/examples of how this can be done.
Thanks.