Hello, I was looking for the same.
As I saw you used Slick that support the fading, I made some changes to your code, I just added some lines to blocks.build.js to add the option and it just works fine.
Find here the code,
https://github.com/gennarooo/carousel-slider-block/blob/main/blocks.build.js
FYI, it’s un-minified file, entirely your code, I just added the lines 64, 95, 158, 223, 235
Feel free to use to make un update to the plugin or improve if necessary.
Best
Gennaro
