Adapting 1/2 hose to sink
Just Googling around a bit, it looks like there's some options.

Disclaimer: These are just search results, not brand or store recommendations. I used the search terms: faucet to 1/2" hose barb adapter.




  Brass Quick Garden Water Tap Connector 1/2 Inch to 3/4 Inch Universal Pipe Fitting Adapter Easy Connect Home Yard/Washing Machine Thread Water Faucet


https://www.amazon.com/Connector-Universal-Fitting-Adapter-Connect/dp/B078JP7HWS




  1/2 in. Drip-Lock Hose Faucet Adapter


https://www.homedepot.com/p/Orbit-1-2-in-Drip-Lock-Hose-Faucet-Adapter-67495/301043975



This one looks to need a standard faucet to garden hose adapter to meet what you're looking for.


  1/2" ID Hose x Swivel FGHT Nylon Swivel Female Insert


https://www.usplastic.com/catalog/item.aspx?sku=63003&amp;gclid=EAIaIQobChMI6v7UnPr24wIVhsBkCh2h8wqIEAQYCyABEgIJmvD_BwE



This one also looks to need a standard faucet to garden hose adapter, but at least it's brass.


  Brass Fitting - 3/4" Male Garden Hose X 1/2" OD Barb | Compact


https://www.ontariobeerkegs.com/Brass_Fitting_3_4_MGH_x_1_2_Barb_Compact_p/brass-3-4-mgh-x-1-2-barb-comp.htm



I can find plenty of faucet to 1/4" adapters, but not a many to 1/2". There's also plenty of adapters to a standard garden hose, but that doesn't seem to be what you're looking for either.

Normally shopping suggestions aren't a good fit for this site, but I think trying to find a non-standard part might be. If people disagree, please vote on the Question, not my answer.