"Last comment" column in the dashboard gadget

Atlassian solution partner identified pattern with current customer's. Customers would like to have an overview of last comments for different issues. Partner thinks our dashboard gadget is perfect for this with additional column. He believes there is great use case here. Also, in Jira, he would like to include this custom field "last comment" provided by ESU in the filter so when he gets notified by email - that this custom field showing last comment is also there. Are these 2 scenarios possible?