It is possible to add other languages to the game, the languages includes commentary and all could be added, to switch between them go to game settings and change the language to your preferred one.
PES 2020 All Commentary Language Packs: contains 19 commentary language packs for eFootball PES 2020 on PC
2456 players original + 5674 added and 1202 team callnames for eFootball PES 2020 on PC by preador002
7263 player call names and 1165 team call names for PES 2019 on PC by predator002
Alternative English Commentary Team - V1 - Last Updated 21/06/2019 (Jon Champion & Jim Beglin) for PES 2019 on PC by predator002