Simplified expression for retrieving attribute value in In-Memory DB list

In Olap Lists, if you want to retrieve an attribute for a List block which uses a dynamic expression (e.g. reference to dimension in the View "POV"), you have to enter a formula-like expression which requires escaping quotes etc.

To simplify this for the common usecase of attribute retrieval, introduce a new possible syntax, such as:

${dimensionname|attribute}

When used, the attribute value of "attribute" for the element used in view for "dimensionname" is used when the List is calculated. This would allow looking up some element from an attribute (e.g. a "PreviousMonth" in a time dimension)

This is similar to already existing expressions like ${dimensionname - 1}