Constants are useless without an app (like excel), so use an ole instance to get the constants, the best way to get constants, direct quote from the docs/Win32::OLE::Const

    use Win32::OLE;
    use Win32::OLE::Const;
    my $Excel = Win32::OLE->new('Excel.Application', 'Quit');
    my $xlcon = Win32::OLE::Const->Load($Excel);
    ... $xlcon->{xlMarkerStyleDot} ...
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