Everything you mention is already possible…
Look below the diagram and you will see a number of links PNG, SVG, TXT, and Edit. You can share the diagram by right clicking and copying the link. In all the links you will find that the diagram text itself is included in the URL as base64 encoded text. You can that the diagram in the first three links or share the link to Planttext directly opening your diagram. Let me know if I am missing something and you are trying to do something else. Cheers.