Transfer Fiji --> Sin -->India

i am returning from Fiji to India in may booked 2 separate tickets

flight 1 -> fiji to Singapore

flight 2 -> Singapore to India

i have a layover of 3 hours, my question is will Singapore airlines transfer my bags ? can i request it ?

else i might need visa and do immigration and re check bags..

how can i combine both these 2 separate PNRs to avoid taking bags and re checkiin bags..

fyi- Fiji Airways and Singapore Airlines have code share from 2018

pls help..