Thank you for bring this up. This is exactly what WebCatalog is built for. Every app you install through WebCatalog works just like a Mac app so you can switch between them using Alt+Tab.
For each app, if you need to, you can divide the app into workspaces (similar to how Slack workspaces) which you can switch between using Cmd+1, Cmd+2, etc.
For each app, if you need to, you can divide the app into workspaces (similar to how Slack workspaces) which you can switch between using Cmd+1, Cmd+2, etc.