How to echo terms count in MBView?

I have custom taxonomy 'collections'. For each collection in requested array of collections I want to display a number of custom posts associated with that collection. I searched through docs and found no clue. Can I directly employ PHP code in MBView, or I need to stick to Twig?

I created an MBView with

{% set args = {taxonomy: 'collection',hide_empty: false,include:9,10,109,111} %} //only for certain collections array of IDs
{% set collections = mb.get_terms( args ) %}

{% for collection in collections %}
<div class="background-collection">
		
		<div class="collection_name">
			<div>Collection</div><br>
			<h2>{{ collection.name }}</h2>
		<div class="button">View: _COUNT SHOULD BE HERE SOMEHOW_ models </div>
		</div>
	</div><!-- end of background-collection -->
{% endfor %}