Using custom attributes to map values to a fully qualified type name

I am working on a .NET project that needs to take a plaintext value, and, given that value, instantiate a specific object type designed to store and work with it.

For example:

Say I am given a file containing the following three lines of text:

Role|Manager
Company|ComputerCompany
Age|27

Furthermore, I have defined the following class structure:

public abstract class Field()
{
    public string FieldDataType;
    public abstract void CustomBehavior();
}

public class StringField : Field
{
    public string value;
    
    public StringField ()
    {
        FieldDataType = "String";
    }
    // implement CustomBehavior() here
}

public class IntField : Field
{
    public int value;
    
    public IntField ()
    {
        FieldDataType = "Int";
    }
    // implement CustomBehavior() here
}
...

When my file parser reads in the line "Role|Manager" I want to use the text "Role" to create an instance of the StringField type using reflection and store the value "Manager" in it.

Similarly when I read in the line "Company|ComputerCompany" I want to use the text "Company" to create an instance of the StringField type, and when I read in the line "Age|27" I want to use the text "Age" create an instance of the IntField type.

Is there a way, perhaps using attributes, to map a known list of field names such as "Age" "Company" and "Role" to a set of custom qualified type names?