PowerShell:
cat Temp\dashboard-plus-reset-filters-to-default-plus-turn-off-one-cascading-filter.json `
| Select-String '"count": [0-9]+' `
| select -expand Matches `
| % {$_.Value} `
| sort `
| gu
Unix:
cat Temp/dashboard-plus-reset-filters-to-default-plus-turn-off-one-cascading-filter.json \
| egrep -i '"Count": [0-9]+' \
| sed -e's/^[ ]//' \
| sort \
| uniq --count
I still like Unix (bash) better for this sort of thing.