The fastest workaround I found makes use of the Bilingual Excel file type: 

1. create an excel file with the source text in column A and target translation in column B

2. add this file to Trados using translate single document and activating the Bilingual Excel file type in the extended dialogue 

3. configure the file type to read source from column A, target from column B, and confirm all present translations 

4. once the file opens in editor, select batch task "update main TM" and you're done.

In fact the fastest workaround is this:

https://appstore.sdl.com/language/app/tutotm/998/

We built this plugin last year I think.

It‘s a brillant app indeed, but it lacks the option to add metadata like notes, source, context etc. Hopefully the dev team will add this feature in the future.

It‘s a brillant app indeed, but it lacks the option to add metadata like notes, source, context etc. Hopefully the dev team will add this feature in the future.