For Oracle I have information about tablespaces for more than a year now.
In Custom Charts select "Used space" for tablespace size:
Then, split the information. You can then filter it by your needs:
MS SQL monitoring extension is planned to be released either this year, or early next year.
First version won't be able to report DB size, as we'd like to minimize the metrics splitting to minimum, and gather some feedback on what's needed for future releases.