Currently I do this as follows:
On the card, have the field contents in an input box that is outside the viewport, with a button within the viewport that selects the text in the box when clicked.
In AHK, have a hotkey that clicks the button and then does a ^c to get the selected text into the clipboard.
Is there a better way? At some point I thought I read that Anki was going to implement a method of writing directly to the clipboard.
For background, when starting a new language I often want to look at the card audio in an application called Praat that gives you a lot more detail and allows you to compare your own version much more closely. I know people will say Anki’s not designed for that but you can also see it as an extension of the “record own voice” functionality.