Re: Can we do performance testing with TestNG suite in Jmeter
TestNG is just a test runner i.e., it helps you run your tests.
How you make use of TestNG as a test runner is totally upto you.
You can create a gradle/maven project, add up TestNG and JMeter as a dependency, and then from within a @Test method create a JMeter sampler which does what you want. TestNG has no say in how its being used.