I am not sure what is your problem. There is no equivalent for this. In Forms you can sefine multiple columns as Display Columns. In APEX you have 1 Display Column and an equivalent return value.
When you use a "Popup LOV" as Item Type you can choose for Input Type between
- Enterable, Show and Store Return Value
- Not Enterable, Show Display Value and Store Return Value
You have to define the Items "Source Type" to be "Database Column". And then use the apropriate LOV Definition to "translate" the stored return value into a visible display value.
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