I'd think that it may be available for other Cities as well. So do some research. It's not something that's publicly advertised by Lyft yet I guess. I googled it but nothing came up. Maybe in a few days?
Introducing the Lyft Line Commuter Pass for Chicago
Get four weeks of Line rides for one low price of $55. At 40 rides, that's just $1.38 each.
ON SALE UNTIL 10/1 — LIMITED AVAILABILITY Four-Week Pass for Chicago
Rides must start and end in the pass zone. Valid 10/1-10/31 during weekday commute hours (7-10 AM, 4-8 PM), for 40 free rides (up to $20 max per ride). Your pass will appear as a payment method in the app.