How to append files to snap?

I’m using JetBrains software. Now I need to add a file to the /snap/phpstorm/current/lib directory, but I can’t add it.

I put the file in the / home/user/snap/phpstorm/current/lib directory, but it doesn’t work.

My main purpose is to load phpstorm language packages into software.

How to realize it, thank you.

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