Filling in a multivalued list in Bitrix 24 with CRM Forms?

Question

Bitrix24

Good afternoon.

I created a CRM form in Bitrix 24, which I plan to use as registration for the event. In this form, we need to transfer the values ​​of several multivalued lists (custom fields on the Contact entity) to Bitrix. The difficulty is that we can't figure out how to pass multiple values ​​into one list. The default value is set and passed, but this is not enough.

Tried the following form code:

<script id="bx24_form_inline" data-skip-moving="true">
 (function(w,d,u,b){w['Bitrix24FormObject']=b;w[b] = w[b] || function(){arguments[0].ref=u;
     (w[b].forms=w[b].forms||[]).push(arguments[0])};
     if(w[b]['forms']) return;
     var s=d.createElement('script');s.async=1;s.src=u+'?'+(1*new Date());
     var h=d.getElementsByTagName('script')[0];h.parentNode.insertBefore(s,h);
 })(window,document,'https://b24-хххх.bitrix24.ru/bitrix/js/crm/form_loader.js','b24form');

 b24form({"id":"5","lang":"ru","sec":"gioa1j","type":"inline", "presets": {"CONTACT_UF_CRM_ххххх": "вар0", "CONTACT_UF_CRM_хххх": ["вар1" , "вар2"]}});
</script>

At the same time, the corresponding fields were included in the "Default field values:" section in the CRM form settings.

Perhaps somehow you can select several default values, but this is not visible in the CRM form settings.