-i3bar does not support any color or other markups, so stdin should be plain
-utf8, one line at a time. If you use *i3status*(1), you therefore should
-specify 'output_format = none' in the general section of its config file.
+i3bar supports colors via a JSON protocol starting from v4.2, see
+https://i3wm.org/docs/i3bar-protocol.html