Hello,
No, currently this can't be done, however instead of Extention Attribute 2 you can use one of the properties that support multiple values, for example, CustomAttributeTextMultiValue1. This is one of Adaxes virtual properties that can store multiple text values. Virtual properties are not stored in AD, but can be used the same as any other property of AD objects. You can use 1 value for each line of text.