You can use F. on the first bar then put a part marker on bar 2 and F on bar 2 Generate > Freeze Drums then change F. to F... and remove F from bar 2 beat 1 to bar 2 beat 3 or 4 or bar 3 beat 1 etc.. now Generate.
That will play the post fill on bar 2, to get it to play the pre and post fill put the F on bar 1 beat 4.