This will need some additional research. I am thinking when the DB instruction is assembled, it will store a the byte in the assembled program along with a label that can be used as an operand.

OK, I think I see what you are saying. After looking around I found two ways DB is used:

var_name DB 0xff

var_name: DB 0xff

The latter one would be easier to deal with.

var_name: 
DB 0xff
DB 0xfe
MOV a, var_name
MOV b, var_name+1 ; <- how do you do label offsets?  Is that a thing?

Is this how you think it would be used, or is a label required for every DB?

Yes, label offsets are a thing (thankfully).

I don't think it should automatically include a label. In ”real” assembly, you put your own label before any "db"s you need them for.

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