I’m trying to work out if an app was distributed with a service that ran in a separate process, e.g via XPC service on Apple platforms, could LGPL libs be legal

I’m trying to work out if an app was distributed with a service that ran in a separate process, e.g via XPC service on Apple platforms, could LGPL libs be legally statically linked only to the service code, which would be open sourced. The service and main app would not be linked at compile time so LGPL wouldn’t apply to the main app, which could remain closed.