Is it possible to programmatically slot elements in web components?

A 2-element slot antenna array based on substrate integrated waveguide for MIMO communication systems is proposed in this paper

In which: $element is an element slots is a property for getting slot variables For example, if you want to obtain a collection

element slot Lit-Element with Slots using @webcomponentswebcomponentsjs, lit-element

elements slot The HTML slot> element allows users to create shadow DOM The shadow tree is a collection of elements in a