Change Serialization of Property by an Attribute

Is it possible to create an attribute that customize the serialization of a property?

This is the example:

public class SimpleDto
    public string Prop1 { get; set; }

    public string Prop2 { get; set; }

Then I want to apply a function on Prop1 during the serialization process, based on a external condition.

Can I do this?

No custom behaviour possible at the property level only customizable per type.

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