Hello, I am displaying custom object records in Datatable via @wire, Since account is a lookup, it displays account id instead of account name. How can I display the name of the account in the colum. 

I have tried the following but it doesn't work. Please suggest.
 {
        label: 'My Accounts',
        fieldName:'My_Account__r.Name
        type: 'text',
        sortable: true
  }