There is new blog post about Grafana/NetXMS integration. Maybe object queries might help you with interface display options.
Post:
https://netxms.com/blog/grafana-configuraiton-in-netxms

Wow, Wow..Thank you so much Tatjana Dubrovica. This is a life saver. I have struggled working with infinity plugin to get all the things I want. Though I have made a little progress, the blog post provides a lot more granular insight. I really do appreciate this..

For DCI data please check this request:
https://netxms.org/documentation/adminguide/rest-api.html#dci-values

This is my example of configuration:
URL: http://10.5.5.111:8000/v1/objects/108/data-collection/183/history
UTL query params:
   timeFrom $__from/1000
   timeTo $__to/1000
Root: values

For status map I'm not sure how it can be created with help Ifinity plugin but check API that returns array with objects: https://netxms.org/documentation/adminguide/rest-api.html#get-multiple-objects-with-filters

The only option for maps as for now is to create link in NetXMS that afterwards will be used in IFrame plugin to insert it to the dashboard.

First endpoint also just works without Grafana plugin (it just provides data in human readable way).

Thank you for the support Tatjana Dubrovica. I have successfully retrieved the Alarms via API on grafana. I was wondering if I can do same to retrieve the following via API. Are there limitations? I cant find any clue on the API documentations.

1. DCI
2. Status Map
3. Device interfaces as it is on NetXMS UI and hardware inventory
4. Maps - the nice map showing real time statistics of link and interface states

If not supported via API, can it be done by querying the postgres database directly?

Thank you soooo much. it worked. I resorted to using option 2 since I am using newer version of grafana and it does appear the plugin is deprecated on newer grafana version

Our old Grafara plugin had it's own data point (that is still present and works): 
/grafana/alarms
Call examples:
/grafana/alarms - gives object id to object name 
/grafana/alarms?targets=[{}] - will return all alarms
grafana/alarms?targets=[{"alarmSource":{"id":108}}] - to get alarms for object with id 108
You can add as many elements with required object ids in array needed: [{"alarmSource":{"id":108}}, {"alarmSource":{"id":512}}, ...]
 
Another option is to add parameter resolveReferences=true to webapi/alarms request like: http://x.x.x.x:8080/webapi/alarms?resolveReferences=true 
This parameter adds full information about alarm source node, source event name and names of users if possible to resolve.