I agree, that we can't know for sure, if they are for this particular Elizbeth Chant, but based on the fact Robert remarried in 1768, it is possible that one of them could have been his wife.
Establishing the facts is hard, due to information provided on the records, in that time frame.
There doesn't appear to be any more children born to this Robert and Elizabeth after 1761.
As there were two couples, Robert & Elizabeth CHANT, living in West Chinnock at the same time, I have separated the births, based on my DNA matches to their descendants.
I definitely descend from the other couple, Robert CHANT(1700) & Elizabeth DAVIS/DAVEY, again, based on DNA matches to descendants of Robert's siblings.