Qt WebEngine should allow the selection, copying and pasting of text via touch events. So far only the selection of single words over touch works.
This could be done similar to Chrome.
To copy a text in Chrome:
1. First do a long press on a word. The word gets selected.
2. Then allow to fine tune the selection with text sliders
3. Finally, show a context menu containing the "Copy" action
To paste a text in Chrome:
1. Long press in a text input field shows up a context menu containing the "Paste" action.