Cool effect. No way, for now, to create this by webflow core slider.
Combine Webflow and modern sliders like: slick, swiper, OWL, Flickity – Add custom CSS styles
The Phone is transparent png - with empty screen (located in the center + z-index).
The active/current slide - positioned to fit on the empty screen of the phone.
The scale effect is by some
transform (Normal CSS). regular slides- with
style1 - Active/current tab with
style2 - (CSS transition/transform from 1–>2)
Example - scale+blur
This is more freelancer job - no way to solve this by forum Answer. But this is the direction for this idea.