Hi
at the moment there isn't a similar option as there is for the accordion option simply because it makes sense to have that option for accordions which are expected to expand/collapse whereas buttons and tabs that's not really the expectation. You could potentially add an empty 'nested page' as the first nested page but probably not great from an accessibility perspective. Likewise you could try something similar with the interactive list page where the first list item is empty but again need to be mindful of accessibility.
HTH
Ron