As of today it is possible to display mirror columns in one board from the other, alternatively you can display a mirror column from a board where there is a mirror column (a mirror of a mirror).
It would be amazing if it would be possible to add more options to mirror columns -
- The ability to perform a filter on a mirror of a mirror column
- The ability to perform formulas on a mirror column
- The ability to perform automations on a mirror column
And in general perform more operations from a wider range of options on regular mirror columns as well as mirror mirror columns.