We already have this ability via our Zapier integration
Given that these are by definition "custom fields" and also given how many different notifications different customers might want for different scenarios, we recommend doing this sort of custom notification with Zapier. Prospect has full support for Zapier actions when a field (or combination of fields) is changed so this would probably work well for you. You can then configure any number of actions.
We already have this ability via our Zapier integration
Given that these are by definition "custom fields" and also given how many different notifications different customers might want for different scenarios, we recommend doing this sort of custom notification with Zapier. Prospect has full support for Zapier actions when a field (or combination of fields) is changed so this would probably work well for you. You can then configure any number of actions.
If you're interested in using zapier for this (or anything else) please contact support via the chat and they can provide details on how to get started. You'll also find some information here: https://docs.prospect365.com/en/articles/6413542-zapier-integration-preview