Hello Saha,
Welcome to the Microsoft Q&A platform.
When creating Dedicated SQL Pool, Geo-backup is automatically enabled, meaning data is placed on RA-GRS (Read Only Geographically Redundant Storage).
To verify this, check 'Geo-backup policy' of the Dedicated SQL Pool after creating SQL Dedicated SQL pool,
And we don't provide any customization options. The only thing customers can select is whether to enable geo-backup or not in the Dedicated SQL pool.
As synapse dedicated SQL pool is not a Zonal resource. we can't achieve ZRS on the dedicated SQL pool.
I would suggest submitting this feature request to the Synapse feedback channel, which would be open for the user community to upvote & comment on. This allows product teams to prioritize your idea against our existing feature backlog effectively and gives insight into the potential impact of implementing the suggested feature.
https://feedback.azure.com/d365community/forum/9b9ba8e4-0825-ec11-b6e6-000d3a4f07b8
I hope this helps. Please let me know if you have any further questions.