I would not recommend you to do so because tax authorities may challenge this. However, there are rulings which says that even if you file return on or before the due date of belated return (31 March 2019 in your case), you will be allowed for the exemption.
But it's aggressive position and project to litigation.
Please feel free to call/ revert in case you need more clarity.
Thanks and regards
Abhishek Dugar
CA CS B.com