How to change status line %W output format

"Liu, Yuanzhe" <[email protected]> Thu, 25 Jul 2019 11:25:20 +0000

Newsgroups	gmane.comp.gnu.screen.user
Message-ID	<D8894E429E23F64C933819D8A13FA07E0169274C@SHSMSX106.ccr.corp.intel.com>

Hi,
      The default %w will get something like "0 zsh 1 zsh ....", but I want to make it to "[0][zsh][1][zsh]....", which will take less place and much more clear for me to find the window I need.
       Is this possible for version 4.03.01?

Regards,
Yuanzhe

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