'Wagtail ChoiceBlock dynamic default value

I have a wagtail ChoiceBlock, thats dynamically loading it's choices from a function. My question is how do I set the default as the first value returned from that function?

index = ChoiceBlock(
    choices=get_blog_index_pages,
    required=True,
    help_text='Select a Blog Index to filter dynamic results'
    default=?
)

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'Wagtail ChoiceBlock dynamic default value

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