Hi there,
There's no built-in role for this, and I am not aware of a custom role you could create for this either (source: https://www.azadvertizer.net/azentraidroleactions/microsoft.directory_directorysync_allproperties_alltasks.html).
The only specific custom role related to Entra Connect allows write actions so this is not a solution.
By default everyone can 'read' Entra, unless you've changed that then the built-in RBAC role 'Directory Readers' will allow the user to view 'Entra Connect' configuration as read-only, but also all of Microsoft Entra.
Hope this answers your question. If it does, please mark as accepted.