Can the “Commerce Products”-field allow for selection of variants? The client wants related products on individual product pages.

Is it possible to have the “Commerce Products”-field allow for selection of variants rather than products as a whole? Or is there another way to achieve this functionality?

If not, I was thinking about letting the client paste the variant ids into a table field or something, then pull the variants onto the product page with ajax. Seems quite hacky though, so any alternatives are most welcome!

Thank you kindly
At the moment there is no Commerce variants field type unfortunately.   It comes up a lot, someone should post it here: https://github.com/craftcms/commerce/issues. 

Edit - I've gone ahead and posted this here - https://github.com/craftcms/commerce/issues

In the meantime yes a text or eg table field could store variant IDs...which I suppose is ultimately what a proper field type would do basically.