Equivalent of using an eval inside a stats sum(count)?

I have the following search used to gather data which is used later in a hiddenpostprocess search :

index=blah | stats count by Product_Group, Application, Severity, _time

My postprocessing seach is :

stats sum(count) AS Count by Product_Group Severity

Which outputs the data in a multiline per product format. ie.

Product_Group Severity Count
A   Major   1
B   Major   1
C   Major   6
C   Minor   1
D   Minor   2
E   Minor   1
F   Critical 92
F   Major   117

3 columns. Product_group Severity and count.

I would like to format the data like this.

Product_Group Critical Major Minor
A 0 1 0
B 0 1 0
C 0 6 1
D 0 0 2
E 0 0 1
F 92 117 0

Prior to using postprocessing a search that would provides the format I want would be :

stats sum(eval(Severity="Critical")) AS Critical, sum(eval(Severity="Major")) AS Major, sum(eval(Severity="Minor")) AS Minor by Product_Group | sort - num(Critical)

Is it possible to use an eval within a stats sum(count)? Anytime I try to do an eval inside that I get zero values.

edit #1: Tried using a chart command

| stats sum(count) AS Count by Product_Group Severity | chart Count over Product_Group by Severity

But it is not fed the correct data so its wrong (but right visual format however!).