In that event, he finished just ahead of fellow Englishman Max Eaves, who claimed a bronze medal in Delhi.
Lewis has also qualified for the last two World Championship finals and he believes his form is good enough for him to contend for a medal in London.
"Things are going really well at the moment," he added. "I've just had a great weekend in France, where I got the 'A' standard for the Olympic Games and the 'A' standard for the World Indoor Championships.
"I'm in good shape, I'm healthy and I'm super happy with where I'm at.
"If you look at the history and heights that have won medals at previous Olympics, 5.70m won a medal in Beijing.
"I think it's about finding the performance to suit the day and I don't see any reason why I can't be shooting for medals in London. I think that would be a realistic goal.
"I've got a great coach, great support and a good network of people around me. I just hope things can come together."
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