Filter dashboard by google analytics column

Hi there, people!

I’d like to have a chart showing my Analytics sessions by day, in a chart, within a dashboard. But I’d also like to be able to filter by medium through which I acquire my users. I can group by date and medium in the query builder, while keeping the medium hidden from the chart, as below:

But, once editing my dashboard, I can’t apply the category type to that question at all (even removing the date field for good):

How can I get it working, like the usual questions? Or is this a known bug?

Running metabase 0.31.0.

Found an open issue:

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