Labels as byte values in inline assembly

[britlion]

If I had code that wanted to make a jump table, and still be able to compile it such that it can move around, how can I do this?

That is, I want something like

jump_table:
defb routine1
defb routine2
defb routine3


routine1:
<code>
ret

routine2:
<code>


routine3:
<code>


The design calls for a jp (hl). I could probably code around it, but I'm wondering how I could get label locations into the actual bytes compiled?