* The group’s stock market value jumped 60% in one year * Stellantis presents new strategic plan on March 1 * Investors await his plans for China by Giulio Piovaccari MILAN, Jan 18 (Reuters) – If the comparison with Tesla TSLA.O has become the obsession of the automotive sector, Stellantis STLA.MI can boast of a successful year 2021 since its share price shows a higher increase than that of the title of the American manufacturer. But the hardest part remains to be done for the group resulting from the merger between PSA and Fiat Chrysler: the strategic plan that its...