Set these under components.Segmented in your token file, or pass them to ThemeScope to change one region of the page.
Component Tokens
Segmented's component tokens, with their values in the default theme. Set one and it applies to every Segmented under the provider.
Tokens the item radius reads
The item radius is not in the table above, because it is not a Segmented token. It is worked out from the radius tokens and the track padding, so it follows your theme with nothing to set per component.
Global tokens
Set these once and every component in the kit moves with them, Segmented included.
Global Tokens
The global tokens Segmented reads. Set one under components.Segmented to change it for Segmented only, or at the top level to change every component.