From security point of view, it would be interesting to see if a device has BIOS/UEFI password set. I believe that this information would fit nicely to your existing "Security related information" (such as antivirus state and SecureBoot state).
Some vendors have WMI classes to provide this information.
Yes, likely in some form. Main "issue" with the FW password status is that not all machines support reading it (either via vendor-specific interfaces or through generic Windows' data) so it is still somewhat open how good indicator it would be, for instance, security readiness.
Furthermore, some manufacturers - like Dell - require installing additional vendor-specific OS level software in order to make it possible to read the status from within OS.
Will this be available through portal or Excel export?