[yocto] How can I change the default ext4 or etx3 of the rootfs to ext2 or jffs2 in yocto build?

[Nguyễn Thanh Vũ]

I want to minimize the size of the image built in core-image-minimal.
However, I have no idea how to change the local.conf file or recipe file.
Can anyone help me?
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