OCI Document Generator Loop in loop with sum Aggregation MS Word tags

I have a simple question: With OCI Document generator MS Word template, is it possible to combine Loop in Loop tags with Sum Aggregation? I have tried getting it to work, but without success. Additionally, the document generator is used in APEX, if that is a factor for the tag combination to work.

MS Word template example I have tested

{#layer_1} {#layer_2} {NUMBERS} {/layer_2} {layer_2|sum:NUMBERS} {/layer_1}