Authenticated Web App Scanning in Nessus using HTTP login form and HTTP cookies import issues

Question

Context: Run Nessus web application scan using Authentication credentials HTTP login form (Login Form Authentication);

Official guide does not help me with figuring out how to determine the login parameters of a web page;

I have already attempted the using JSON key value pairs (for example, {"username": "%USER%","password": "%PASS%"}) and

also followed steps to resolve the issue, using information from below listed pages:

1. Web Application Vulnerability Testing with Nessus presentation; page number: 96
2. https://stackoverflow.com/a/50199945/10053482
3. https://www.tenable.com/blog/scanning-web-applications-that-require-authentication
4. https://community.tenable.com/s/article/How-to-Configure-Web-Application-Authentication-in-Tenable-io-WAS
5. https://community.tenable.com/s/article/Credentialed-Web-App-Scanning-in-Nessus-6

But nothing helped for a web page which does not supports http URI query-string parameters based login.

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Another issue that I am encountering is I am not able to debug why Authentication / Credential Info (Hosts) using HTTP cookies import (Cookie Authentication) is Failing

For this I tried changing the logs settings as listed below

log_details: yes
log_whole_attack: yes
backend_log_level: debug

But I dont see any useful information in logs to understand why the authenticated scan is failing with using Cookie Authentication

Kindly advice