It would be great to see a shoe size conversion widget introduced. I often find myself (like when purchasing Kagi socks) trying to convert between UK/EU/US shoe sizes — although there are of course plenty of others. This is a functionality that Google does not have and part-fulfils via AI mode. Quick Answer and AI summaries generally aren't a particularly sleek solution for an objective measurement conversion like this.
See current examples below.
EU to UK — Google

EU to UK — Kagi

UK to US — Google

UK to US — Kagi

WolframAlpha has a conversion calculator already, so perhaps Kagi could plug into that. See here.

This would be a major time saver for me, and perhaps for other users. Saves clicking through to different sites, or relying on Quick Answer to summarise these.