Distinctively represent an optional record field in the type view of the architecture diagram

[nipunayf]

Description:
$title.

Describe your problem(s)

Consider the following type which has an optional symbol.

type CodeData record {
    string org;
    string module;
    string node;
    string symbol?;
};

When represented in the diagram, the optionality of a field is not visualized to the user. It would be better if we could have a UI element to indicate this in the diagram.