Using Composites and Lines

I have a requirement to create flow charts(similar to attached).
To achieve this, the nodes(GWT composite) and lines should be displayed together.

So the nodes(GWT composite), will display the table with multiple rows of textbox, dropdowns etc.
And the lines will connect the nodes.

I understand that flow chart requirement cannot be achieved using Graph Explorer, but I wanted to know that instead of text, can a composite be used?