I have created a graph for displaying the results of a deep learning model I have trained (see image below). I would like to add a symbol (e.g. a small cross or square) at the epoch with the highest values for the F1-scores, and the lowest values for the losses. For example, in the case of the TEST_LOSS, I would like to add a small symbol on top of the continuous red line at epoch 16. Is this possible in LibreOffice Calc?
Thanks a lot in advance!