this is very bad approach because album play count will be dependent on the number of tracks on the album. 'average' is much better (but not ideal too). but if you want it:
in additional tagging & reporting tools plugin use auto-library reports command:
add album artist group for new preset, add album group, add 'sum(play count)' function. then assign some function id to this preset. create virtual tag with formula: $ALR(<URL>,function_id), add this virtual tag to the main panel.