Sliders are relatively complex elements for accessibility.
They will often be flagged in accessibility audits, and will become a sticking point for a fair bit of your a11y compliance work.
Webflow Slider
Fortunately, Webflow's slider has updated to add some features in this area, which may help.
https://discourse.webflow.com/t/how-to-build-an-accessible-dropdown-in-webflow-with-custom-code/85931
Swiper.js
Often a popular solutions for this is swiper.js which has a wide range of a11y capabilities.
https://swiperjs.com/swiper-api
aria-hidden=true
One limitation of swiper.js may be the aria-hidden attribute when is meant to be applied to all hidden slides.
Here are some notes and possible solutions;
https://codepen.io/ademcifcioglu/pen/mBgazz
https://github.com/nolimits4web/swiper/issues/2169
https://github.com/nolimits4web/swiper/issues/2929
