Here you can find some scripts which I wrote in order to have JIRA integration in GoogleDocs.
Copy the script code and add it to your google doc in script editor. Enter valid data for USERNAME / PASSWORD / JIRA URL This enables the following functions:
function GETJIRASUMMARY(input) Get issue summary / title
function GETJIRAREPORTER(input) get the issue reporter
function GETJIRAPR(input) get a Github Pull Request from any of the comments (last found is used)
function GETJIRAPRAUTHOR(input) get the author of the issue comment which includes the Pull Request
Example Usage in GoogleSheets: Put the following formula into any field: =GETJIRASUMMARY(JIRA issue nr or link)
The script can be easily extended by any of the JIRA API provided method.