You can check these links. They are official food safety guidelines or reports from generally acknowledged official sources and either state clearly that you can work with hepatitis B (with precautions) or don't mention it at all, focusing on hepatitis A as a more serious threat.
Use them as a reference/key words for further research for your own country!
I do have to say that there are mentions in forums that foreign workers with hepB have to undergo medical exams to get visa and some have mentioned that either they needed to undergo immunization through anti-hep B vaccination or were denied the visa altogether in UAE or Saudi Arabia. I can't say for certain what happens in your country in this case, especially since South Asia doesn't kind of narrow down the list of countries!!!
Your best chance is to contact your local food safety agency/authorities (and my personal input is to first ask generally what happens in this case, don't straight up go and say "I have this problem", cause from my experience sometimes the initial reaction is panic, and then decide on your course of action).
Hope something from above helps!