I see that Mocha has been updated. Can the newer version be added to Hitfilm?
Mocha Hitfilm tends to lag about a year behind the stand-alone version (As does Mocha Ae). This is likely a marketing/licensing concern. Mocha Pro is $1300. Mocha Hitfilm is two of six modules - so a third of the program - for $50.
You're more likely to see Mocha update to 2020.5 than 2021 at this point.
Its revealed now that Boris and Mocha will be updated in Hitfilm 16. But i also think they are going to update it to Mocha 2020.5 instead of 2021.