Structured data (breadcrumb) smarty v2, how to number elements?

Question

PHP

Hello. I have a line of code that outputs a page path (breadcrumb) and breadcrumb structured data.

{if !($page.main&&($mode||$news_post)) && ($e.page_id!=$site.page_id) && ($e.url!="/") && !$hide_e_page}
            {$path_separator}
            {if $e.page_id==$page.page_id&&(!($mode||$news_post)||$mode=='album_list'||$mode=='main'||$mode=='default'||$mode=="archive"||($mode=="index" && $page.plugin_name == 'board'))}
                {$delimiter_left}
                {if $allow_tags}
                    {$e.name|htmlspecialchars_decode}
                {else}
                    <span itemscope="" itemprop="itemListElement" itemtype="http://schema.org/ListItem"><span itemprop="item"><span itemprop="name">{$e.name|htmlspecialchars_decode|strip_tags}</span></span>
    <meta property="position" content="1"></span>
                {/if}
                {$delimiter_right}
            {else}
                <a href="{$e.url}">{$delimiter_left}{if $allow_tags}{$e.name|htmlspecialchars_decode}{else}{$e.name|htmlspecialchars_decode|strip_tags}{/if}{$delimiter_right}</a>
            {/if}
        {/if}

Tell me, what command should be inserted inside content="" in order to make the numbering, depending on the level of nesting of breadcrumbs?