Chase will add 500 to 1,000 mortgage servicing jobs to its Central Ohio workforce when it moves into new offices in Gahanna later this year, the banking giant said Wednesday. Chase, the banking arm of JPMorgan Chase (JPM), already is the region’s largest private employer with 17,000 workers in the Columbus area. The additional workers will help homeowners struggling with their monthly mortgage payments, Chase said. New employees will augment Chase’s staff at a 495,000-square-foot facility in Easton that Chase uses for mortgage servicing. “This is part of our extensive efforts to help customers who are facing financial difficulties,” said Frank Bisignano, CEO of Chase Home Lending and chief administrative officer of JPMorgan Chase. In mid-2009, Chase originally announced an initiative to add jobs in Central Ohio by the end of that year. Write to Kerry Curry. Follow her on Twitter @communicatorKLC.