Chaining links in ViewModel

I am binding a model record to my ViewModel using the links config. This record has a property that has an ID of another model record. I want to load this second record and bind it to the same view. What is the best way to do that? I tried:

Code:

            viewModel: {
                links: {
                    primaryRecord: {
                        reference: 'MyModel',
                        id: someId
                    },
                    secondaryRecord: {
                        reference: 'MyModel',
                        id: '{primaryRecord.secondaryRecordId}'
                    }

                }
            }

The documentation says that value of each property in the links config can be a bind descriptor. The above does not work for me. What am I missing?