It’s not a “workaround” that you have to hyphenate the lyrics before you paste them – that’s a prerequisite for using the feature. I’m not sure why you would want not to have a hyphen in the original lyrics produce a hyphen when you paste. It seems to me – and I guess I must be misunderstanding something – that these issues are two sides of the same coin.
In Sibelius I can copy lyrics from a lyrics page (found somewhere in the internet) and then copy the words automatic hyphenated (the correct language preselected) into my score. I thought this would be possible now in Dorico as well.
I am very disappointed that I have misunderstood this new feature and hope that this will come.
The hyphenator Dan suggested only works with Englisch text.