The Table Grid Editor is a JIRA add-on that allows you to store tabular data in the context of an issue.
It is available in Atlassian Marketplace.

It is possible to synchronize the data contained in such grids between the two instances by using the Table Grid API in the Incoming sync.
The following script example shows how this can be done.
Incoming sync
1 import com.atlassian.crowd.embedded.api.User
2 import com.atlassian.jira.component.ComponentAccessor
3 import com.atlassian.jira.issue.CustomFieldManager
4 import com.atlassian.jira.issue.fields.CustomField
5 import com.atlassian.jira.security.JiraAuthenticationContext
6 import com.atlassian.plugin.PluginAccessor
7 import com.atlassian.jira.user.ApplicationUser
8 import com.atlassian.jira.user.util.UserManager
9
10
11
12
13 // get TGE custom field
14 // replace 'mytable' below with the name of the table grid
15//
16 CustomFieldManager customFieldManager = ComponentAccessor.getOSGiComponentInstanceOfType(CustomFieldManager.class);
17 CustomField tgeCustomField = customFieldManager.getCustomFieldObjectsByName("mytable").get(0);
18 Long tgeCustomFieldId = tgeCustomField.getIdAsLong();
19
20 // get exalate user - replace 'exalate' below with the user name of your proxy user
21 UserManager userManager = ComponentAccessor.userManager
22 User exalateUser = userManager.getUserByKey("exalate")?.directoryUser
23
24 // Get access to the table grid api
25 PluginAccessor pluginAccessor = ComponentAccessor.getPluginAccessor();
26 Class dataManagerClass = pluginAccessor.getClassLoader().findClass("com.idalko.jira.plugins.igrid.api.data.TGEGridTableDataManager");
27 def tgeGridDataManager = ComponentAccessor.getOSGiComponentInstanceOfType(dataManagerClass);
28
29
30
31 // Provide the data which needs to be added
32
33
34 Map<String, Object> row = new HashMap<String, Object>();
35 row.put("isummary", "Some summary");
36 row.put("iassignee", "admin");
37 row.put("istatus", "Done");
38 row.put("idue", new Date().getTime());
39
40
41 try {
42 List<Long> rowIds = tgeGridDataManager.addRows(Long.valueOf(issue.id), tgeCustomFieldId, Arrays.asList(row), exalateUser);
43 } catch (Exception e) {
44 // log an error if things go wrong, but continue with the synchronisation.
45 log.error("** Failed to add data due to " + e)
46 }
47
48
49
50 // do the normal sync stuff.
51
52 issue.summary = replica.summary
53 issue.description = replica.description
54 issue.comments = commentHelper.mergeComments(issue, replica)
55 issue.attachments = attachmentHelper.mergeAttachments(issue, replica)