I don't believe so, but I'll try to find out (...no promises on a quick response). In the meantime, could you explain what kind of data you would be interested in bringing in about assisted conversions? Are you just looking for a coarse breakdown of the estimated sources of conversions, or are you hoping to go deeper with that data?
Short answer is no, the Google Analytics data is fixed in the Last Non-Direct Click model.
Because the data required to provide assisted click is lost, as no other Attribution model data is available, you can't link to previous activity. In order to provide this, you'd need to be able to track incoming customers to your site yourself, or through a third party such as Infinity - Infinity Cloud Global Call Tracking Solutions - This is the only way I've been able to reproduce anything close to it, although due to differences in deduplication the numbers will likely never be 100% the same as GA.