There are a some online SVG based grid builders like ooorganize etc. available, do a Google search after this topic. - These allow to setup a grid and then to download it as SVG vector format which you can import/open/place into the Affinity apps.
There are a some online SVG based grid builders like ooorganize etc. available, do a Google search after this topic. - These allow to setup a grid and then to download it as SVG vector format which you can import/open/place into the Affinity apps.