So it's about 375x100 days free rations on BPL card. That calculates to INR 37,500 (USD 1.37 per day). This is entirely different from calculating poverty.
Below is a document released in 2020, and according to that, no poverty estimates have been released after 2013, based on the Tendulkar poverty line, on poverty data related to 2011-12.
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What's Tendulkar poverty line?
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After that, another committee recommended revision to INR 47 and INR 32 for Urban and Rural from INR 32 and INR 26, but no action was taken by the Indian government.
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I am still unable to find the source that translates your poverty line to PKR 400,000 p.a.