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