I want to enable import as measure for a custom filed in eazyBI

How to enable import as measure for a custom filed of type Single Select List having numerical values in eazyBI.

For that custom field already there is code written as below

[jira.customfield_xxxxx]
data_type=“string”
dimension=true
separate_table = true
changes = true

What additional lines I need to add to enable import as measure.