ROME, Sept 29 (Reuters) - Italy will sharply lower its target for the public debt on Wednesday to 153.5% of national output from a previous goal of 159.8%, according to a draft of a forecasting document to be published by the Treasury. The draft of new Economic and Financial Document (DEF), seen by Reuters, is currently being discussed by the cabinet ahead of approval. The latest debt target would mark a decline from the post-war record of 155.6% registered in 2020. The draft of the DEF forecasts economic growth of 6.0% this year, slowing to 4.7% in 2022, and targets the budget deficit at 9.4% of gross domestic product this year, falling to 5.6% in 2022. Prime Minister Mario Draghi and Economy Minister Daniele Franco will present the DEF at a news conference at 1400 GMT. Reporting by Giuseppe Fonte, writing by Gavin Jones Our Standards: The Thomson Reuters Trust Principles.