VideoTicker.brs

sub init()
  ' ...
  m.itemsListNode = m.top.findNode("tickerItems")
  ' ...
end sub
' ...

sub onContentChange()
  if m.top.itemsList <> invalid
    m.itemsListNode.insertChildren(m.top.itemsList)
  end if
end sub

' ...

VideoTicker.xml

<?xml version="1.0" encoding="utf-8" ?>
<component
  name="VideoTicker"
  extends="Group"
  xsi:noNamespaceSchemaLocation="https://devtools.web.roku.com/schema/RokuSceneGraph.xsd"
>
  <script type="text/brightscript" uri="VideoTicker.brs" />
  <!-- ... -->
  <interface>
    <field id="itemsList" type="array" onChange="onContentChange" />
  </interface>
  <children>
    <VideoTickerItems id="tickerItems" />
  </children>
</component>

VideoTickerItem.xml

<component name = "VideoTickerItem" extends="SimpleLabel">

</component>

VideoTickerItems.xml

<component name = "VideoTickerItems" extends="ContentNode">
  
</component>