Using second pivot as a means to order main pivot - just like with dimensions

One thing about dimensions I like is that I can have month_num and month_name next to each other, only show month_name but use month_num to order them correctly.

I have a dimension that is producing time buckets like these:

Q1 2019
Q2 2019
Q3 2019
2018
2017
Older

I created second dimension called field_order giving them respective numbers:

Q1 - Q4 - get a value between 1-4
2018 & 2017 get its own year
Older - 9999

I wanted to use them for ordering, which works fine:

image

but I can’t remove them from vis so that the number doesn’t show up in the legend:

image

Would be so great to have the Hide in visualisation here
image

I know I could rename the Series but those are totally dynamic. Next year they will automatically switch to:

Q1 2020
2019
2018
Older