Synology NAS - add new drive and change RAID type

I have DS220+ with 1 3TB drive, and basic raid (no data protection).
I want to add another 3TB drive, and change the RAID type to SHR.
On the storage pool action menu I have no "Add Drive" option, When selecting "Change RAID type" my only option is to apply it to the old drive.
So the right way to do it is to change RAID for my storage pool to 1, than add new drive, than change RAID again to SHR?
No faster way to go from basic to SHR?

Solution 1:

SHR is meant to be used to save disk-waste if a more common RAID set is chosen when you have multiple HDD with different storage capacity. Ref: https://kb.synology.com/en-my/DSM/tutorial/What_is_Synology_Hybrid_RAID_SHR

If you have 2 identical HDD capacity - then there is no point of doing SHR. You might as well go straight into RAID1 (full redundancy).

Edit: Thanks gronostaj - had not considered that upgrade path.

Edit2: Going through Synology forum and KB - I don't see any option available. Do try to reach out to Synology support and see what they say. You can contact them from the Synology DSM - and open the "Contact Support" app - under Storage & Virtualisation - Change RAID type / RAID migration - and see how you go.