New Delhi, March 25 Jio Platforms is likely to file its Draft Red Herring Prospectus (DRHP) with Sebi in the coming days, paving the way for what could be India's largest-ever IPO.According to market sources, the offering will be structured as a sale offer, with several existing foreign investors preparing to reduce their stakes.In separate reports last year, Jefferies had estimated Jio's valuation at USD 180 billion, while JP Morgan had pegged the valuation of Jio Platforms – the entity that houses Reliance Industries' telecom and digital businesses – at USD 136 billion.The DRHP could be filed as early as the end of March, and discussions are ongoing with over a dozen foreign investors to reduce part of their stakes in the...