Toggle nullable context in `omnisharp.json` for csx scripts

[colinfang]

I am using vscode C# extension to manage a few csx scripts without .csproj

My omnisharp.json is

"script": {
     "enableScriptNuGetReferences": true,
     "defaultTargetFramework": "net6.0"
}

However, by default it doesn't enable nullable context, unless I add #nullable enable at the top of csx.

Would it be possible to toggle nullable context via omnisharp.json similar to <Nullable>enable</Nullable> in .csproj?