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Label Selector in Reports
In Multi-Account reports, you can choose to see previously created Google, Microsoft, or Optmyzr labels for individual accounts. This can be found in the 'Manage Report-level Selectors' window, under any Google or Microsoft accounts present in the Account & Campaign Selector widget.
Performance by Platform and Optmyzr Labels widget
Under the "Tables" section of widgets, you can find the "Performance by Platform & Optmyzr Labels" widgets, which will display the performance of selected campaign labels.
Labels for Amazon and Facebook
For the moment, these platforms are not supported in the label widget, however, for both Amazon and Facebook, you can set up and select an Optmyzr label to report on through the account picker.