Commandline "help" for Windows Cmd(Mingw64)

Trying to get the commandline to show Mingw64 online help manual on Windows10Pro-64 Cmd/Powershell, similar to the "man command_name" command on Bash (which shows verbose online manual help for the stated command_name as seen here @1.42).

Gcc has been added to the Environment variables path and is available globally.
However on doing a "gcc --help" in both Cmd/Powershell , no "man" command is available for windows
Also tried using other help commands like

gcc --help command_name  gcc --help "command_name"gcc --target-help command_namegcc --target-help "command_name"gcc --help = {command_name}gcc --help = {"command_name"}

but the terminal simply gives an error:-

gcc: error: command_name : No such file or directory 

Mingw64 reference docs do not provide any sample code.

How to get the help manual from the command line in Cmd/Powershell?