How do I change the privacy setting of profile pics on my timeline to "friends of friends"?

Are profile pic updates on timeline also Facebook posts? I set my facebook posts to "public" "friends of friends" and "public" back again, but still the default setting in "friends" for profile pic updates on my timeline appears to be "friends". I tried changing it to "friends of friends" for each of my profile pic updates, but that option is just not showing up under "edit privacy". What's happening?

2019-12-04T19:52:41Z

The default privacy setting for profile pics remains "friends" and there is no option to change it to "friends of friends"

?2019-12-04T20:13:21Z

If the Option is not there then it wont be possible to Change it to Friends of Friends