Hey there Hwi,
for this case you must involve an issue screen in this transition.
Go under administration - issues - screens and create a new one for this transition - set your wanted fields in this screen.
After you created the screen you can go in the workflow section - your workflow and edit the affected transition.
There you should have an edit button on the right top - there you can set the screen for this transition.
When you want the fields on the transition to be required you have to set a validator on this transition as well.
If your standard JIRA doesn't have a suiting validator you have to install some workflow plugin - if I remind right misc workflow got the feature to check fields.
PS - don't search long for the field comment on the screen.
Comment is always on a screen even if you don't set fields on it.
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