go mod子目录结构

I'm using the following struct on my project, but it feels hacky

App
├── go.mod
├── app.go
└── src
    └── foo
    |    └── foo.go
    └── bar
        └── bar.go

Is there a way to organize it like that?

App
├── go.mod
└── src
    ├── app.go
    └── foo
    |    └── foo.go
    └── bar
        └── bar.go