Bones mapping and skin weight changes for Standard CC characters are not allowed.
Actually individual toes are weighted but for whatever reason are not allowed to be tweaked in CC for Standard CC characters.
You can do that in Blender though and rig pointed heels there as well (via pipeline).
There is a "High Heels" tool in CC. But it deforms shoes badly most of the time if used alone.
And it obviously does not address individual toes posing. On the other hand you may use hide mesh tools to hide toes which are popping out.
And I sure recommend importing DAZ heels separately and rigging them either in CC or Blender.
Here is my CC workflow:
One last thing is about foot posing in DAZ and CC.
There is a significant difference since in DAZ a JCM is used and there is no such a thing in CC by default.
You may download static JCM morphs for CC and use Heels Flexing for better DAZ heels fit:
https://forum.reallusion.com/FindPost386118.aspx