Currently the copyright and last modified information must always be rendered together as part of `{{#data-footer.data-info.array-items}}{{{html}}}{{/data-footer.data-info.array-items}}` but it's likely much more preferable if these two can be rendered separately.
In the upcoming design changes for Vector 2022 we'll be rendering last modified information at top of page rather than the footer so we should work towards making this data more malleable.