Use x64dbg variable or expression for block address

[not6]

Hello, it would be very useful if you were able to do something like this:

<lastalloc+123> ; $lastalloc is a x64dbg variable
    ; asm code here

Currently it seems like doing this is not possible and it can get quite annoying if you allocate memory in the target process and want to assemble code there since the resulting address is usually random and you have to manually input it in Multiline Ultimate Assembler everytime. It would be great if this was possible to automate instead and it doesn't sound like it should be too hard to implement