Hi Dario,
Thanks for using Syncfusion products.
As per our existing API structure, Adornments can be defined along (inside) the series and adornments do have the property for controlling its visibility. As we are defining the series from code behind, we are supposed to define the adornments in code behind.
However we can achieve your requirement by initializing the ChartAdornmentInfo as a resource in xaml and access while creating object for series. We have prepared the sample based on your requirement and please download the sample in the below location.
Sample: HideLabel.zip
Please let us know if you need any further assistance.
Thanks,
Rachel. A