Set these under components.Breadcrumb in your token file, or pass them to ThemeScope to change one region of the page.
Component Tokens
Breadcrumb's component tokens, with the values the default seed produces. Set one and it applies to every Breadcrumb under the provider.
Global Tokens
The global tokens Breadcrumb reads. Set one under components.Breadcrumb to change it for Breadcrumb only, or at the top level to change every component.