VSCode Code Spell Checker work with user dictionary

In my company, we're using VS Code together with the Code Spell Checker extension for Latex documentation. Now I'd like to create a company-wide used dictionary so that not every user has to add the specific words to its own dictionary. But I couldn't find the right information on how to do this.

I created a txt companyDict.txt file on the server so that it's available for everyone. Then I added the following lines to my VS Code settings.json

"cSpell.dictionaryDefinitions": [
        {"name": "CompanyDictionary", "path": "//server/Documentation/Template/companyDict.txt"}
    ],
    "cSpell.dictionaries": [
        "CompanyDictionary"
    ],

Should that work so far? Do I have to possibility to tell the spell checker to add new words specifically to this dictionary or are user dictionaries "read-only"? How does such a user dictionary look like?