Since Design Tokens are basically a design decisions, the ones that are responsible for taking them should be the Designers.
We are fulfilling this idea by using Figma Tokens plugin. Thanks to this, Designers are able to maintain token names as well as references and values from the environment that they are most comfortable with.
To store all their work, a plugin's feature called Github Sync is used. It allows designers to commit their changes directly to the github repository, straight from the simple Figma Tokens plugin UI.
All Designer's work is kept at the develop branch. Merging this branch to master will cause a release of the new version of Design Tokens Library.