Yes, its possible. Any cook can tell you that.
But request to collect or take the chicken bones from others
after they gawned on it, is kinda hygenic. Recommend you do
it only at your table, with the friends and families you know to
collect the chicken bones for your soup.
Do take note, that you need to wash the chicken bones, boil in
one time, throw away that 1st boiled bones soup.
And make the actual soup base with the bones again.
haha but i think the KFC bones will lose its flavour after being
fried..