Removing Square brackets from JSON message before publishing to Pubsub

We are publishing CDC changes from Oracle table to GBQ PubSub, however the Striim is publishing JSON Array with square brackets with one CDC change. I don’t want those flower brackets , how can we resolve this. Even I tried to change the Advance setting of No.of events to 1 in the pubsub connector but still the events are coming with square brackets. Kindly help me how i can remove those square brackets.

Thanks,

Murali