Do you provide Loadout value per-player field in CS2 games?

Yes. Per-player loadout value is equipment_value, exposed (a) in the live match state on LiveDataFeed under each player's CS2PlayerCurrentRoundState.items.equipment_value (updated via partial updates as inventories change), and (b) on MatchEventsFeed in the player_inventories map of CS2FreezeTimeEnded and CS2RoundEnd. The player's cash is right next to it as balance. Note that the equipment_value field on the CS2ItemPurchase event is deprecated and intentionally empty. You they should use the sources above.