You don’t need an oven to ‘dum’ the briyani you can also do that on the stove, one way is to heat your tawa on a low heat and put your covered pan on that.
the tawa spreads the heat even under the pot.
if you don’t have tawa then use a metal lid big enough to put your pot on
i use something like this called a heat distributor
mine doesn’t have the long handle