Convert SVG to PNG/JPEG in ePUB files

Dear All,
I have Kobo Aura H2O with KOReader installed. Since KOReader lacks a fully compliant support to SVG files, I was wondering when converting a xx file (e.g., html) to ePUB with Calibre, there is a way to convert all the SVG included in the input document to some plain raster format (png, jpeg...)

Thanks in advance!