In Power Automate, you can use the Dataverse connector to access data in Dataverse and call bound and unbound APIs. However, not all REST API endpoints are available in the connector, and it doesn't support impersonating another user. To overcome these limitations, you can use the "Invoke an HTTP request" action with the "HTTP with Microsoft Entra ID (preauthorized)" connector. This allows you to call any Dataverse/Dynamics 365 REST API from Power Automate, with or without impersonation. You can start by calling the WhoAmI endpoint to validate the connection, and then use headers to impersonate other users if needed.
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