For example, customer dim has string element attribute called 'gender', I want to control the input by allowing only 'F' or 'M'
Its like element attribute of element attribute. I've tried creating a static one. a new dimension was created with name '}ElementAttribute_ElementAttribute_dim' but the dropdown doesn't seem to appear.

Can't find any info online - the keyword 'picklist' and 'element attributes' yields only ways to 'create picklist with element attribute', not 'creating picklist for element attribute'.
Thanks in advance