How to change zstd level for qcow2 image?

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There is an option compression_type=zstd to enable zstd compression for qcow2 according to wiki.

But it always uses zstd level 3, how could I do to compress it with level 19? This image is read-only and I just want the max compression level.

The command I use now is:

qemu-img convert -p -f qcow2 -O qcow2 -c -o compression_type=zstd,preallocation=off win10.qcow2 win10-zstd.qcow2

Other info:

Linux fedora 5.17.5-300.fc36.x86_64
qemu-img.x86_64 2:6.2.0-9.fc36


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