...
Depending on the selected formation, the player may assume different positions on the field. Their exact location is graphically presented in the table below and is the same as the "Player's position" statistic assigned to a player. The “Players position” statistics are available through events.sub-participants.index endpoint.
...
"id": 717,"name": "Player's position","short_name": "P. position.","value": 11,"data_type": "integer"
Please note: For each formation, the players' position values are numbered from 1 to 11 and they are assigned always starting from the goalkeeper and then successively from right to left side of the field.
Formations
We are currently using 12 different formations with the player’s positions listed in the table below:
...