Question Can you use a CompletionProvider in Unity?

Hello!

I am trying to add custom auto-completion to visual studio.

I followed this tutorial and it is working well.
I then tried to replace the code with a CompletionProvider inheriting class, something along the line of:

Code (CSharp):

1.     [ExportCompletionProvider("MyCompletionProvider", LanguageNames.CSharp)]
2.     public class MyCompletionProvider : CompletionProvider
3.     {
4.         public async override Task ProvideCompletionsAsync(CompletionContext context)
5.         {
6.             context.AddItem(CompletionItem.Create("This is a display text",
7.                 properties: new Dictionary<string, string> { { "Key 1", "Value 1" } }.ToImmutableDictionary(),
8.                 tags: new string[] { "tag 1" }.ToImmutableArray()));
9.         }
10.     }

But I get nothing in visual studio.

I'm new to using roslyn API so the above code may just be wrong, but I tried the code from this page and it doesn't work either.

Hence my question, can you use a CompletionProvider in Unity?

Thanks a lot!