Here is my catalog_product_view.xml: I want to insert one CustomBlock to this final price block, so i can use getChildHtml() to call in template final_price.phtml, but it does not work so far, why ? <referenceBlock name="product.price.final"> <block class="MagentoFrameworkViewElementTemplate" name="custom.block" template="CustomModule::custom.phtml"/> </referenceBlock>