In the mobile app for Microsoft Flow, you can share button flows (buttons) with other users or groups within your organization. When you share a button, the person or group with whom you share can trigger and run your button, the same way they run their own buttons. You can stop sharing your buttons at any time.
For more detailed information, please refer to:
https://flow.microsoft.com/en-us/documentation/share-buttons/
You can submit the idea in the Flow Ideas forum, so it might be considered for future releases.
https://powerusers.microsoft.com/t5/Flow-Ideas/idb-p/FlowIdeas
Regards,
Mona Li