Is it possible to fire notification event on specific custom field edit. So that notification is sent only if custom field xxxxx is edited, but not when other fields are edited. If it is possible please advise how...
You need to code to do this, and in the core of Jira.
There's no way for Jira to know what fields you wish to arbitrarily ignore. When an issue is edited, an event is fired, there's nothin in the event system that says "fire different events based on what fields have changed" and you'd need to embed that in the core.
The only way to do this off-the-shelf is to move the edit of fields into the workflow, then you can control what fields are offered to users and what events are fired.
You can try Jirassimo for that (https://marketplace.atlassian.com/plugins/net.vacom.jirassimo/server/overview)
Have a look at the https://jirassimo.com/web/examples in section "Example #7, Checking if particular field was changed"
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