Mirror of stripe of Raidz3

Hi,

I have 88 discs and I want to configure them as follows:
11 discs (8+3) in raidz3 (8 raidz3)
4 of raidz3 in a stripe for big size (2 stripes)
Until here it's possible and looks like

tank ONLINE 0 0 0
raidz3-0 ONLINE 0 0 0
gptid/fec5265c-2f9d-11ed-9b1f-002590ca45ba ONLINE 0 0 0
gptid/ff283a78-2f9d-11ed-9b1f-002590ca45ba...

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