In short RA-GRS is available to you without M$’s help. GRS needs a failover triggered by M$

https://docs.microsoft.com/en-us/azure/storage/common/storage-redundancy-grs

  • GRS replicates your data to another data center in a secondary region, but that data is available to be read only if Microsoft initiates a failover from the primary to secondary region.
  • Read-access geo-redundant storage (RA-GRS) is based on GRS. RA-GRS replicates your data to another data center in a secondary region, and also provides you with the option to read from the secondary region. With RA-GRS, you can read from the secondary region regardless of whether Microsoft initiates a failover from the primary to secondary region.