MT-6000 Making new directory on ROM

I'd like to create a folder on the 8GB flash drive of the MT-6000 router. I'd like to use them for persistent volumes for Docker. I can't quite work out how to achieve this. There only seems to be a /rom and /overlay mountpoint for the flash drive. Is there something else I need to do to get this to work? Really appreciate the help. Thank you!

You can't create directories on /rom because it's read-only.

Please check [OpenWrt Wiki] Extroot configuration to understand how to extend your root filesystem.

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