XF 2.2 field-adder trigger button?

[D.C Style]

I was wondering if there's any solution for this. For example, I have this

<li data-xf-init="field-adder">
   <xf:textbox name="example[]" value="" />
</li>

Everyone knows it will automatically be added each time we type something in the textbox. But I want to add something like this

<xf:button data-xf-click="field-adder">{{ phrase('add') }}</xf:button>

Does anyone have an idea?