Create calculated value field

[hirok]

I have two or more issues located in different Projects.
Those are linked with a specific link type.

I'd like to display calculated value which is total number of specific field values in in all the linked issues.
The calculated value('Total' below) could be displayed on read only custom field.

ex.)
ISSUE-1
Total : 5
Field A : 1
Link : ISSUE-2, ISSUE-3

ISSUE-2
Total : 4
Field A : 2
Link : ISSUE-3

ISSUE-3
Total : 2
Field A : 2

Could you please give me some advices to achieve this?

[Vishnukumar Vasudevan]

Perhaps, you can use the plugin 'https://marketplace.atlassian.com/plugins/com.onresolve.jira.groovy.groovyrunner' which has a field type 'Scripted Field'. You have to write a script to update this field with the number of Issue Links. I have't tried this yet. Just a suggestion.