I want to create a VSCode extension, which allows me to hide certain files in the File Explorer using Extension Settings.

My status quo looks roughly like this:

package.json

{ 
  "contributes": [
    "configuration": {
      "properties": {
        "<extension-name>.hideResultFiles": {
          "title": "Hide result files from File Explorer",
          "type": "boolean",
          "default": false
        }
      }
    }
  ]
}

extension.ts

export function activate(context: vscode.ExtensionContext) {
    vscode.workspace.onDidChangeConfiguration(e => {
        if (e.affectsConfiguration("<extension-name>.hideResultFiles")) {
            updateFileExplorerExcludes()
        };
    });
}

// Process extension file exclusions
async function updateFileExplorerExcludes() {

    const config = vscode.workspace.getConfiguration()

    var excludeList: { [k: string]: boolean } = {};

    if (config.has("<extension-name>.hideResultFiles")) {
        if (config.get("<extension-name>.hideResultFiles")) {
            excludeList["**/*.outA"] = true;
            excludeList["**/*.outB"] = true;
        }
    }
    // apply excluded files/folders
    config.update("files.exclude", excludeList, vscode.ConfigurationTarget.Workspace)

}

This works. The downside is that all the excludes are added explicitly to settings.json

{
  "files.exclude": {
    "**/*.outA": true,
    "**/*.outB": true
  }
}

How do I have to modify my code so that the excludes are not added explicitly to settings.json, but rather only the setting itself is added, and the excludes are handled internally?

Desired look of settings.json:

{
  "<extension-name>.hideResultFiles": true
}