Yes you can use embedfile to embed any kind of file (within the includepath spec)
Supposing you had a file: t.txt containing ABC
sys p
embedfile "t.txt",p
byte b at p
print b[3] '67
I haven't got a formal parameter for length but, since it is stored as a pseudo-bstring, you can recover the length like this:
dword le at (p-4)
print le '3