XFGETCELL() with Drilldown - V8

Hi all,
I'm 100% certain that I read somewhere that Version 8 would include a new XF function for Excel add-in that would allow us to drilldown on a cell whose data is retrieved via an XF function.

However, now that we are upgrading to Version 8, I cannot find any information about that at all.  Even a search in the OneStream documentation does not show any XF function that allows this.

If anyone has a link or more details about this expanded functionality, would you be kind enough to share that here?

Thanks in advance