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As far as I know, I’m afraid we don’t. It’s quite an old map and we can’t provide continued support on all of our old projects. However, you should have a look at this documentation page; you should be able to convert the world to Bedrock format using the method: https://learn.microsoft.com/en-us/minecraft/creator/documents/chunkeroverview
Since Osgiliath is quite old, it is likely that you would have to first load it in a newer Minecraft Java version and load all the relevant chunks before attempting conversion. This should be the most time-consuming step, but it might be possible that this converter or another one could automate it. You’d just have to look around the documentation and try searching for more info on converters; maybe the older MCC Toolchest could help with converting from old versions.