We currently have basic styling options but we don't support adding and editing links yet.

For reference, here's how adding a link looks in Aztec:

And how the add/edit UI looks on the web:

I think for the alpha we could do with the simpler approach we can implement (a dialog) but we should do some design explorations for the beta. I'm not sure the existing floating UI that we have on the web will work great on mobile. cc @iamthomasbishop