@ArtsyPowerApper shows how to retrieve tile values from a Power BI tile alert and bring them into PowerApps. Note: Actual tile values are returned once the alert is triggered.
Learn more about Flow Integrations with PowerApps:
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/using-logic-flows
Learn more about Power BI Alerts:
https://docs.microsoft.com/en-us/power-bi/service-set-data-alerts
Learn more about the Flow Triggers for Power BI:
https://docs.microsoft.com/en-us/power-bi/service-flow-integration
Flow template:
https://preview.flow.microsoft.com/en-us/galleries/public/templates/048dbe30de7d408594023685bd551c1c/trigger-a-flow-with-a-power-bi-data-driven-alert/