Example of preview settings for init.vim/.vimrc to provide coloring?

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Sorry, relatively new Vim user.

Could somebody provide an example of how to get a coloured preview?

I have `bat` installed. Can I amend this line in my init.vim to make the output coloured?

`nnoremap :FZF --preview=head\ -20\ {}`

I have tried every combination of `--color=always` and the like but no dice.

I have tried copying in the Advanced customisation https://github.com/junegunn/fzf.vim#advanced-customization but running them makes no difference.

This DOES work: https://gist.github.com/danmikita/d855174385b3059cd6bc399ad799555e

However, I wanted to get highlighting on the default FZF? What am I doing wrong?