Not exact what you want but as I know in DEBUG MODE, there is an option for primitive Types (int, long,…).
Switch to Debug perspective.
In the Variables view click the
“menu” item (triangle item before
minimize) and select “Java Primitives…”.
In the Dialog you can choose between Hex
view, Ascii view and unsigned (for
byte).
Found this, maybe help: Inside the Memory View
On 3.7 (and maybe earlier), go into preferences, type “primitive display” in the filtering area, and choose to display hex values.