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// Fontawesome
<input class="form-control" name="REX_INPUT_VALUE[1]" value="REX_VALUE[1]" data-iconpicker />
<input class="form-control" name="REX_INPUT_VALUE[1]" value="REX_VALUE[1]" data-iconpicker="fontawesome5" />
// Anderes Iconset
<input class="form-control" name="REX_INPUT_VALUE[1]" value="REX_VALUE[1]" data-iconpicker="iconpickerset" />
<input class="form-control" name="REX_INPUT_VALUE[1]" value="REX_VALUE[1]" data-iconpicker="icomoon" />