How to bind CPUAffinity dynamically for systemd sub-services

I have a systemd bob.target as follows:

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I want to set a two-cpu CPUAffinity for each of the bob@ services as follows:

CPUAffinity=0,4 # bob@0
CPUAffinity=1,5 # bob@1
CPUAffinity=2,6 # bob@2

My ideal goal would be to set two CPUS as follows:

CPUAffinity=%i %i+1

When I try the following to dynamically set one of the CPUS I get a parse error:

CPUAffinity=%i

Is there a way to dynamically set the CPUAffinity?