Does VSCode support autocomplete for Mono namespaces on Mac?

I want to use VScode(1.39) with C# plugin (1.21.5) on Mac(10.14) to develop C# code with Mono(6.4 from Home-brew). I've noticed that trying to complete namespaces names works only for some namespaces contained into "System" and "Microsoft" namespaces, but not for others like "Mono".

using Mono. // no completion options.
using System. // only some namespaces appear.

Does current C# plugin for VSCode supports autocompletion on namespaces name and in functions? If that is the case, to allow completion on Mono namespaces, do I have to do additional configurations?

I tried different values on Mono environment variables like:

MONO_PATH=/usr/local/opt/mono/lib/mono/gac
MONO_PATH=/usr/local/opt/mono/lib/mono/4.7.2-api
MONO_PATH=/usr/local/opt/mono/lib/mono/
MONO_PATH=/usr/local/opt/mono/lib/

MONO_GAC_PREFIX=/usr/local # this is suggested by Home-brew

Changing that do not produce any changes in the results. "Mono" namespaces are not available for completion.