Generally speaking, Entra does not support workload-specific roles, with few exceptions. You can achieve your ask by assigning the user/service principal to the "View-Only Organization Management" Role Group within Exchange Online, or even use a custom-created role therein.
If you meant the above as an improvement suggestion, the best place to put it would be over at the Feedback portal: https://feedback.azure.com/d365community/forum/22920db1-ad25-ec11-b6e6-000d3a4f0789