Softbank invests in Uber India pushing up automobile demand[1]. Indian drivers buy cars manufactured by Maruti Suzuki (54% market share [2]). Maruti Suzuki is a JV between an Indian company (Maruti) and Suzuki (Japan) where-in Maruti pays 6% of sales as royalty for design and other facilities. In addition, you have to realize that Japan exports $35b of auto parts and $101b of automobiles [4]. So any lever which pushes up sales of automobiles in any nation is bound to have an impact on exports.
[1] https://economictimes.indiatimes.com/small-biz/startups/dema...
[2] https://auto.economictimes.indiatimes.com/news/passenger-veh...
[3] https://economictimes.indiatimes.com/markets/stocks/news/low...