You may need to do this with multiple add-ons, however, take a look at Xporter - Export issues from JIRA:
All fields, parent issues and subtasks, comments, attachments (even embedded in PDF!), images, issue links, versions, sprints, components, change history, stories, Tempo worklogs, Service Desk SLAs.
Could you explain better that SVN question, using an example? What do you pretend to obtain on the exported document?
Regarding the second question, yes, you can export easily with one click using our Xporter Panel
(See image attached)
If you have any more questions feel free to ask.
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