With Cwicly update to 1.3.2, ist there any feature/ Block available to switch to dark-mode for visitors at the front end?

it is all enabled (PHP; CS, and JS). if I run the inserted JS code provided within the code block editor, it results in an “Syntax error, unexpected token :”, but if I put it to an online validator, it says the js code is correct simply drag & drop the file into the editor, just take that literally…