Kibana 7.10 Dashboard Drilldown

I've been playing with the new Create Drilldown feature available in Kibana 7.10 dashboards.

On the parent dashboard I have a stacked horizontal bar chart:

• The y-axis (i.e. bar label) is a "Site Name"
• The x-axis (i.e. bar length is count of documents)
• The bars are split by a "Reason Code" (two values).

I've got the drill down configured and working BUT when I select the drill down from a bar on the parent chart it takes me to the new dashboard automatically filtered by both "Site Name" and "Reason Code".

I would like to drill down with ONLY the "Site Name" filter selected. Is this possible?

It's been confirmed by Elastic this option is not currently supported in the Dashboard Drilldown feature. Although it may be possible to achieve the required behaviour using the URL drilldown feature.