This will happen automatically when you change a field. The character mode attributes will continue to be honoured until you change the field and they are converted to Widget specifications. The original character mode specifications can still be accessed via F11 (Inquire) in the Image Editor.
Added:
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You can force APPX to use the old Item Editor by setting APPX_USE_OLD_ITEM_EDIT to a non blank value.
GA/AA combined
The GUI attributes and Additional Attributes at the Frame and Image levels have been combined. When clicking AA at the Frame or Image level, you will see a display similar to the following: