At this time, we aren't aware of a single layer that contains this information at a national level for the UK. There are a few options:
- If you have an existing static map, you could attempt to georeference the file and create a dynamic layer from it. This might not be ideal, as the data will update.
- Scrape data from one of the government webpages and add it to a hosted feature service. This learn lesson might be helpful.
As COVID-19 progresses, it is possible that this layer will emerge, so I would recommend checking back frequently.