About the right-to-left support of Mirador in IIIF toolkit

I am using the following environment.

Omeka 2.7.1
IiifItems(plugin) 1.1.0

I am using Mirador in the IIIF toolkit (IIF manifests) to display IIF images in the exhibition, but Mirador does not support viewingDirection: “right-to-left” in the IIF manifest json, and East Asian materials are displayed left-to-right.

What settings do I need to change to support viewingDirection: “right-to-left”? Or is it possible to change the version of Mirador in the IIIF toolkit?

If anyone knows, I would appreciate it if you could tell me.

Thank you.