How to set and use Column Custom Attributes

Custom attributes can be used as additional fields of column. You can use them in merge fields in any place where column is available as context object ($Column, $SourceColumn, $TargetColumn, etc.).

Go to "Custom Attributes" section of column properties at the right sidebar. Click "add" link, fill in fields "Name" and "Value":

You can add any number of custom attributes with unique names:

Merge fields are not allowed to be used in custom attributes - they will not be calculated and may cause errors.

Save current dashboard. After saving custom attributes will be available for current column context object:

Custom attributes should have "a__" prefix to be used in merge fields: