I haven't seen those yet. Tho I have some old ones. And yes - you'd process as for quarts.
If you have a big enough water bath canner (Lehman's has them) you can safely can juice in 1/2 gallons. Helpful if you have a large family. But the canner is pricey. It's rectangular & goes over 2 burners. Someone who can do metal work could probably make one cheaper.