Blizzard has updated Chromie Time assets to include Shadowlands in Dragonflight.
However, it’s just the assets that have been updated so far. I’ve tested Chromie Time in-game and there’s still no option to select Shadowlands for leveling. Hopefully, we’ll be able to test it out properly in the forthcoming builds.
Chromie Time Assets (Dragonflight Beta Build 45480)
Here are Chromie Time assets without Shadowlands; this specifically is Beta Build 45480.
Chromie Time Assets (Dragonflight Beta Build 45569)
The Shadowlands map and background was included in Beta Build 45569.