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Defender Jugraj Singh broke the Chinese defence as he scored a rare field goal in the 51st minute to hand his team the title.
It was India's fifth consecutive win in the six-team competition.
India have not visited Pakistan since 2008 and the arch-rivals meet only at multi-team events.
India have not yet confirmed participation and there is speculation that the International Cricket Council could use the hybrid model' and hold the country's matches at a neutral venue if the team does not get government clearance to travel.
The hosts edge Malaysia 4-3 in a thrilling final at Chennai.
India will take on Malaysia in the final on Saturday, while Japan will face South Korea in the third-fourth place play-off.
The hosts won 3-2 in their fourth round-robin fixture in Chennai.
India had five scorers on the night, including fan favourite Karthi Selvam.
Harmanpreet equalised in the 43rd minute after Japan took the lead in the 28th minute.
Harmanpreet and Varun scored a brace each in India's tournament opener.