Can we do Data labelling for NER tasks for word document ?

I followed this document https://docs.aws.amazon.com/comprehend/latest/dg/cer-annotation.html to setup the pdf document annotation. But I couldn't find any reference for word document annotation. Our usecase involves getting both pdf and word document from customers.

Are there any blogs explaining annotating word documents or any workarounds ? Are we expected to convert the word doc to pdf then add it into annotation workflow ?

Any help on this is much appreciated ?