64-bit on unity 5.x,About 64-bit on 5.6.x

Google play store will not support 32-bit build after August 1st. 2019, and I use unity 5.6.6 which not support 64-bit. Upgrade unity is a big thing for me. So I want to know if there is a plan to support 64-bit build on unity 5.x? Thank you.,Google play store will not support 32-bit build after August 1st. 2019, and I use unity 5.6.6 which not support 64-bit. Upgrade unity is a big thing for me. So I want to know if there is a plan to support 64-bit build on unity 5.x? Thank you.