@maxlath The closest is prefers-reduced-motion, but that's specifically for UI animation a11y: https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-reduced-motion
Already you can sniff screenreaders using a variety of techniques, but @tink has some interesting thoughts on why you may want to avoid that: https://tink.uk/thoughts-on-screen-reader-detection/