Parallel Aggregates for string_agg and array_agg

Just wanted to check if there is any magic that can be done to make this happen. 

The closest thing I ran into was this guy patch - https://www.postgresql.org/message-id/CAKJS1f8LV7AT%3DAAhdYGKtGrGkSkEgO6C_SW2Ztz1sR3encisqw%40mail.gmail.com

I didn't try it, but wanted to check if there is any way to deal with the need to aggregate on a string, by creating an array while doing a group by? Should I manipulate my data to be able to do it, maybe by generating an int out of those strings? Any other idea?

Thanks!