According to Wikipedia, the teams from AFC will be ranked considering their 2020 Olympic performance (in order identify them as AFC 1, AFC 2 and AFC 3). As only Japan played in the final men's football tournament in Tokyo Olympics of the four teams remaining, I considered the performances in the 2020 AFC U-23 Asian Cup (that served as qualification for Tokyo 2020) and the qualification for the 2020 AFC U-23 Asian Cup. The ranking could be like this:
1. Japan (4th place in Tokyo 2020)
2. Uzbekistan (4th place in 2020 AFC U-23 Asian Cup)
3. Iraq (eliminated in group stage in 2020 AFC U-23 Asian Cup)
4. Indonesia (not qualified for 2020 AFC U-23 Asian Cup)