Keeping track and updating h-var in a repeat

[herrKlein]

Is it possible to increment an h-var in a repeat?
Like in this example where I define a number, and only add the index if a condition in the repeat is true?

I have a working example here, but not the incrementing part.
https://stackblitz.com/edit/vitejs-vite-ztmwpwst?file=index.html,src%2Fmy-element.ts,src%2Findex.css

      <my-element>
        <template id="main">
          <h-var name="count" .value="{{ 0 }}"></h-var>
          <template type="repeat" repeat="{{ sections }}">
            <div style="display: flex">
              <!-- increment count only if item.type == regular -->
              <span>
                <!-- {{ count = count + item.type === 'regular' ? 1 : 0 }} --> <-- I need something like this to work -->
                <h-out expr="count"></h-out>&nbsp;
              </span>
              <span>{{ item.type }}&nbsp;</span>
              <span>{{ item.id }}&nbsp;</span>
            </div>
          </template>
        </template>
      </my-element>

It loops through an array within my-element, and I want to keep track an h-var which should increment whenever an item is a regular item, the result now is this

0 info domestic 
0 regular dog 
0 regular cat 
0 info wild animals 
0 regular bear 

0 info domestic 
1 regular dog 
2 regular cat 
0 info wild animals 
3 regular bear 

I need the count to increment whenever an item is from a regular type, is this possible ?