VCF ignoring vep and non_reference_samples while exporting

I am exporting my matrix table to gcp storage, but it is ignoring fields vep(row) and non_reference_samples(row). How to overcome this and export all data and why is it happening.

VCF does not have a way to represent arbitrary structured data.

It is possible to put some information in the info field:

mt = mt.annotate_rows(info =

this will not work for VEP though.