Extract, edit and save .dwg meta data

I'm building an app that deals with engineering projects. Part of the app requires uploaded CAD files (.dwg) to be assigned to equipment.

What I would like to do is edit the meta data of each file to contain a reference to the part it has been assigned to.

So if a file was linked to part X1234567 I'd like to add this 'tag' to the meta data of the CAD file.

I have been working with the Forge API and see there is an endpoint for extracting meta data documented here but I see no way to put edited data back in to the file.

Is there any way to use the Forge API, PHP, Java or JS to write a method to extract metadata, edit it then save it back to the file?

I'm open to any suggestions to how I can do this.

Thanks

I should also note Java is my last choice, sorry Java guys, I'd really like to keep this in PHP or JS, but can dust off my Java skills if that's the only way.