There are probably a few useful frameworks you can implement off the bat:
1. Establish a clear tiering framework - what constitutes a tier 1 launch versus a tier 3 or 4, what is the desiered business outcome of each, audience, associated GTM tactics for each tier, etc. Aligh with your product team on this framework.
2. Create a GTM Strategy template - that outlines how you plan to take the feature to market. It should include details like announcement date, tier, target audience, goal, messaging guide, and more.
3. Create a GTM milestones template - that details all the milestones leading up to a launch, including the DACI for each milestone and the timeline assocaited with each milestone.
These 3 templates/frameworks could take you a long way, and should be created with contribution from your product counterparts.