The Bridget Jones star co-created Cinnamon Girl with Anthony Tambakis and both serve as executive producers on the drama along with Gavin O'Connor, reports Deadline.
Cinnamon Girl follows four coming-of-age girls - Cassie, Lola, Penny and Lou - during the late 1960s and early 1970s in Los Angeles.
The drama was inspired by Zellweger's real-life journey from a small-town girl to Hollywood star, and Tambakis's interest in the Laurel Canyon music scene and the New Hollywood of the late '60s.
Zellweger previously worked with Lifetime on 2008 original movie Living Proof.
Earlier this year, the third instalment to the Bridget Jones movie series was delayed because of script issues.
Bridget Jones's Baby would reunite its three stars Zellweger, Hugh Grant and Colin Firth.
Grant previously said: "There's been a number of drafts that have had great things in them but haven't quite hit the bullseye.
"But they're working on it again now with yet another writer. As soon as they get to a good point we will do it, I'm sure. It's just that it does have to be significantly reinvented."
Watch a clip from Bridget Jones: The Edge of Reason below: