Force Yaris Hybrid Electric Mode

Hello together, is there the possibility to force the electric mode (in the 2019er)? The duck on the E-mode button generates the message that the speed is too high or the E-mode is not available right now…. Background: I’m driving on a flat track and know that a slope distance is coming soon. In order to discharge the battery before the gradient as far as possible, it would be useful to drive on the level electric. Otherwise, the battery is already on the half distance with gradients v Oll charged and I “heat” energy. It would be nice if someone could give a tip, because Toyota is more likely to sell a new car. The existing customers stay on the track !!! Service- Kindness looks different to me!