Using COUNT with bcftools filter across all samples

[mhoban]

Is there a way to use bcftools filter with COUNT to return only positions with a certain number of values for a given FORMAT entry across all samples?

For example, I'd like to filter out positions where the number of all AD values is exactly two. I can do this for one sample, like this:

bcftools filter -i 'COUNT(AD[0:*]) == 2' input.vcf.gz > filtered.vcf

Is there a way to do this for all samples? Or do I have to enter each position manually? I've tried various permutations of the indexing syntax but it doesn't quite seem to do what I need.

thanks!