How to add titles on my category page ("product-list.tpl")

[AsuPa]

Hi everyone,

I sorted by suppliers the products on my category page/product-list but I'd like to add some titles between them, such 

My category page :

Title: Supplier 1
- its products

Title : Supplier 2
- its products


Do you have any ideas about on how to add title within the product-list bloc? Below the details of the first bloc lines if it can helps..

 

<li class="ajax_block_product col-lg-{(12/$smarty.capture.nbItemsPerLineDesktop)|replace:'.':'-'} 

	<div class="product-container" itemscope itemtype="https://schema.org/Product">

		<div class="pro_outer_box">
   		<div class="pro_first_box">

Thank you,