V9: How do you specify light and dark colour schemes in atlassian-plugin.xml?

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We’ve been using Confluence Data Centre v8, and have a custom plugin that specifies its own colour scheme. In our atlassian-plugin.xml, that looked like:

<colour-scheme key="our-color-scheme" name="Our Colour Scheme" class="com.atlassian.confluence.themes.BaseColourScheme">
  <colour key="property.style.topbarcolour" value="#312D2A"/>
  <colour key="property.style.breadcrumbstextcolour" value="#FFFFFF"/>
  <colour key="property.style.headerbuttonbasebgcolour" value="#C74634"/>
  .
  .
  .
</colour-scheme>

Now we’re about to upgrade to v9, and this no longer works—our colour scheme is not applied to spaces that use our plugin, and it does not appear in the space Look & Feel panel as an option to apply. Also, we can find no documentation on how to specify a colour scheme for dark mode, which was introduced in v9 so we’re now dealing with for the first time.

What should we be doing here?