Advanced lookup: Provide value-based drop-down for Choice fields
for virtually every Action, the workflow designer can use "dynamic" data based on the workflow context, for example, for recipients, filters, notifications etc.
A typical Scenario is a Run-If Action, where the embedded Action should only execute if the value of a certain attribute for "Current Item". Now imagine that the column on which you want to check for the value is of type "Choice", i.e., has a predefined list of possible values.
In order to ease the process of Workflow design, such fields in an "Advanced lookup" should present a drop-down with all possible values to the Workflow designer (currently, is is a free-text Input field).
This is a generalization of the idea https://nintex.uservoice.com/forums/218291-3-nintex-workflow-for-office-365/suggestions/32073550-update-field-choice-columns-not-displaying-choic