The new version of Runtime Flow adds ability to show field values of objects in parameters and return values:
Field values of an object and a struct
Currently only simple field types are displayed and only the fields defined by the class itself. Runtime Flow shows runtime object type – while the first parameter of the OnTextBoxGotFocus function is object, actual TextBox type is displayed.
Auto C# properties are implemented using <field_name>k__BackingField fields. Runtime Flow shows them as <field_name>:
C# auto properties
Enums are displayed as the enum type and the value field:
Enum value
Runtime Flow blog (Understanding a control flow in a running .NET application) 