How To Create Conditional Name Component - Known As or "Fist Name" + Space + "Last Name" ?

Summary:

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I would like to configure it so that:
when there was a "Preferred Name", the "Preferred Name" appears, but in cases where it does not exist, it must present the "Fist Name" + "Last Name".

We did some tests and looked at the documentation below, but I can't find a way to keep it in this format. When adding two lines with conditions, for example, the "Preferred Name" appears duplicated when it exists. And in the condition, I can't associate the "Fist Name" + "Last Name" to come in a single line, how do I do it?