Filesystem for sdcard to store large file and apps access

I am running android oreo 8.1 (custom ROM) on Xiaomi Redmi Note 3 Pro. I have a 64GB memory card in which I want to store large files of size 15GB, 20GB etc. So I can't use FAT32 filesystem. I formatted it to exFAT but battery started draining faster as mount.exfat process uses CPU above 20-30% during read/write operation. If I format to ext4, How can I made sdcard files available to all android apps ? Is there any other filesystem which can store large files and android apps can access it as well ?