Add custom field date type to automation action "set custom field (name) to (value)"

User Problem

User would like to create an automation to update a custom field date based on another custom field. When creating an automation using custom field dates, the action "set custom field (name) to (value)" doesn't include date types in the dropdown list.

For example:
when custom field "date" is set to a date, set custom field "date 2" to "{{%date}+1m}"

Suggested Solutions

Add custom field date types to the custom field dropdown list for the "set custom field (name) to (value)" action

Current Workarounds

Select any custom field from the dropdown list, and add the action.
Then manually enter the custom field date name to override the custom field.