swipe to complete partial words

[makkonen]

Describe the solution you'd like
This may be impossible, depending on the capabilities of the swipe library, but a feature from SwiftKey (and no other keyboard I know of) that I miss since switching to HeliBoard is that you can backspace into a word, and then re-complete by swiping the remainder of the word. It helps when swipe or autocomplete gets close but still misses.