I was able to achieve something realllyyyy close with this custom clear segmented picker: https://gist.github.com/programVeins/c8af54eeaabe2406c81feb4bb606351d

The only missing thing is: the text/labels on the selected pill doesn't get distorted by the glass effect, as the pill is simply like an overlay that is swipable, tappable and bounces very well like the liquid glass that it is.