Just found out that FIA Formula 2 still has the Supersoft compound, as seen here during F2 qualifying at 2020 Russian GP, although it came in form of purple stripes.
So I decide to work on the tire texture extension quickly, using the Pirelli tires created by @Badde for the RSS Formula Hybrid X (I actually being the bad guy here for using the purple tires against his company's policy lol), then copy and recolor one of the texture into the correct color code as Pirelli kindly provided here, and voila.
Drop the files into assettocorsa/content/cars/rss_formula_rss_2_v6_2020/extension
Credits to Badde for the 18-inch Pirelli tire texture.
So I decide to work on the tire texture extension quickly, using the Pirelli tires created by @Badde for the RSS Formula Hybrid X (I actually being the bad guy here for using the purple tires against his company's policy lol), then copy and recolor one of the texture into the correct color code as Pirelli kindly provided here, and voila.
Drop the files into assettocorsa/content/cars/rss_formula_rss_2_v6_2020/extension
Credits to Badde for the 18-inch Pirelli tire texture.