Filter for altering HTML output

Hi, thanks for building such a great and useful plugin!

I’d love to be able to add custom SVG arrows to the next and previous buttons, but I cannot find a filter that allows for HTML output to be changed, only the filters for changing class names.

I want to be able to alter the HTML due to semantics, rather than using pseudo-elements, otherwise, there is no control for how the arrows are ‘spoken’ by screen readers.

Does a filter/filters exist that enables the HTML output of specific buttons, as you have for classes?

Many Thanks