Hi,
No you are not missing it, it just doesn't exist, sorry.
While I understand that it could be useful for adding a few sprites as data in BASIC, it is generally more useful and greatly more optimal to load sprite data from a separate (PRG, binary) file from a BASIC program than to have hundreds of PETSCII text decimal values (DATA statements) written/pinned on to the end of your program.
It is something I might add at some point but most users are either building their projects using the data files exported from SpritePad/CharPad (ie. with the data "baked in") or explicitly loading them (from disk/tape) at run-time.
ie. 10 LOAD "SPRITEDATA",8,1
I will consider adding it but it's kind of a pain in the butt with so many different exports possible (from CharPad, SpritePad) for something that is not needed by many people.
Lines/lists of decimal values never align neatly either, unlike hex :)
Will consider further.
Ps. It may be possible to find a hex editor (or some other standalone tool) that can export a file's byte values as a list of comma separated decimal values .