Fetch count of base elements in BPC logic script

Hello

Is it possible in BPC logic scripts to fetch the count of Base members of a Parent element ?

I have a requirement where the values aggregated at parent level need to be divided by the number of its base elements. Eg. F001 has 4 base elements(SF1, SF2, SF3, SF4) then the calculation should be as

SUM(SF1+SF2+SF3+SF4)/number of base element

So is there any way I can dynamically get the count of base elements ?