Hi,

Say you store

{
   "text": "text 1",
   "image": "udi://...",
}

You would need a value converter that understands that format. You could use the JsonValueConverter if you setup your property editor to have a ValueType of Json.

If you want the image to return an IPublishedContent instead, you would need a model for storing, and another for display.

public class StoredValue
{
    public string text{get;set;}
    public string image{get;set;}
}

public class DisplayValue
{
    public string Text{get;set;}
    public IPublishedContent Image{get;set;}
}

Looking at https://github.com/umbraco/Umbraco-CMS/blob/v8/contrib/src/Umbraco.Web/PropertyEditors/ValueConverters/ContentPickerValueConverter.cs as a base, you would need to override GetPropertyValueType and ConvertSourceToIntermediate

public class YourValueConverter : PropertyValueConverterBase
{
    private readonly IPublishedSnapshotAccessor _publishedSnapshotAccessor;

    public YourValueConverter(IPublishedSnapshotAccessor  publishedSnapshotAccessor)
    {
        _publishedSnapshotAccessor = publishedSnapshotAccessor;
    }

    public override Type GetPropertyValueType(IPublishedPropertyType propertyType)
        => typeof (DisplayValue);


    public virtual object ConvertSourceToIntermediate(IPublishedElement owner, 
            IPublishedPropertyType propertyType, object source, bool preview)
        => JsonConvert.DeserializeObject<StoredValue>((string)source);

    public virtual object ConvertIntermediateToObject(IPublishedElement owner,
        IPublishedPropertyType propertyType, PropertyCacheLevel referenceCacheLevel, object inter, bool preview) 
    {
      var value = inter as Value;
      var image = GetImage(value.image);
       return new DisplayValue { 
           Text = value.text,
           Image = image,
      }
   }

   private IPublishedContent GetImage(string image){
     if( GuidUdi.TryParse( image, out var udi )) {
         return _publishedSnapshotAccessor.PublishedSnapshot.Content.GetById(udi.Guid);
      }
      return null;
   }

}

The above code is just a mockup - not tested... :)

HTH :)

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