Do you mean Access Requests for the App or Access Requests for the Backend SharePoint data source? If its the data source you should be able to create a flow that is triggered by the access request email and then grants permissions to the SharePoint list by adding them to the correct group.
----------------------------------------------------------------------------------
If this Post helped you, please click "Does this answer your question" and give it a like to help others in the community find the answer too!
Paul Papanek Stork, MVP
Blog: https://www.dontpapanic.com/blog