Enhancement in choropleth map to include countries

[nhungbi]

Currently, the olli for choropleth maps does not include a separate detail legend for each country. For example, in the first picture below, we can see the current capability of the olli:

.
There's only one legend. However, I would like the olli to include another legend with each child as a country in the map. Here's an example of the ideal representation:
.

As we can see, there's another legend under the % of vaccinated named country.

The specs in question is:
map.json.

It looks like the current olli does not look at the "detail" field in "encoding".

Please let me know if this enhancement would be possible. Thank you in advance!