How do I sum all numbers from output of jq

I have this command that I would like to sum all the numbers from the output.

The command looks like this

$(hadoop fs -ls -R /reports/dt=2018-08-27 | grep _stats.json | awk '{print $NF}' | xargs hadoop fs -cat | jq '.duration')

So it's going to list all the folders in /reports/dt=2018-08-27 and get only _stats.json and pass that through jq from hadoop -cat and get only .duration from the json. Which in the end I get the result like this.

1211789 1211789 373585 495379 1211789

But I would like the command to sum all those numbers together to become 4504331