workspace import

I have a vsc root-level settings.json file

{
    "deno.enable": true,
    "deno.enablePaths": [
        "./"
    ],
}

{
    "deno.enable": true,
    "deno.enablePaths": [
        "./"
    ],
}

I want to be able to use the following inside of the deno projects inside the directory

{
    "imports": {
        "$std/":"https://deno.land/std@0.217.0/"
    }
}

{
    "imports": {
        "$std/":"https://deno.land/std@0.217.0/"
    }
}

but I am getting the following

Relative import path "$std/assert/mod.ts" not prefixed with / or ./ or ../deno(import-prefix-missing)

Relative import path "$std/assert/mod.ts" not prefixed with / or ./ or ../deno(import-prefix-missing)