Hi Tim,
This community post you refer to (I want to enable import as measure for a custom filed in eazyBI - #2 by gerda.zandersone) explains how the single select filed with numeric values can be created as a measure in eazyBI.
The idea of the Javascript code is to protect the select list values from being not numeric since otherwise the field cannot be imported as a measure and will throw the error you have reached.
All the fields by default are imported also as properties and can be referred to at the Issue level like [Measures].[Issue Field One].
Kindly,
Janis, eazyBI support