Limited ANSI colors in PowerShell

[remkop]

When running the checksum example, either as a Java process or as a native image, in PowerShell, only the command name checksum is highlighted in the usage help message. The rest of the message does not seem to use any of the ANSI colors and styles:

PS C:\Users\remko> .\checksum.exe
Missing required parameter: <file>
Usage: checksum [-hV] [-a=<algorithm>] <file>
Prints the checksum (MD5 by default) of a file to STDOUT.
      <file>      The file whose checksum to calculate.
  -a, --algorithm=<algorithm>
                  MD5, SHA-1, SHA-256, ...
  -h, --help      Show this help message and exit.
  -V, --version   Print version information and exit.

Debug output:

[picocli DEBUG] (ANSI is enabled by default: systemproperty[picocli.ansi]=null, isatty=true,
  TERM=null, OSTYPE=null, isWindows=true, JansiConsoleInstalled=true, ANSICON=null,
  ConEmuANSI=null, NO_COLOR=null, CLICOLOR=null, CLICOLOR_FORCE=null)