If you want them just required during a transition I suggest the jira-suite-utilites plugin. It is free, supported, and been around for a long time. The only drawback is it doesn't put an * next to the required field.
It is done using field configurations. See https://confluence.atlassian.com/adminjiracloud/specifying-field-behavior-776636443.html#Specifyingfieldbehavior-requirefield.
Edit: Just noticed that you want it mandatory only on certain transitions. In that case you have to use a workflow validator. You can use the "Fields Required" validator from JIRA Suite Utilities plugin.
Thanks very much!
You can use it during transition with the "Mandatory field validator" from Workfow Essentials. It also puts an asterisk * in front of the field.
https://marketplace.atlassian.com/plugins/de.codecentric.jira.wes/server/overview
It looks like the Jira suite utilities is $1800 not free?
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