use of java.time.Instant in javascript

How might I convert this beanshell preprocessor script in jmeter to neoload javascript?

import java.time.Instant;
String epoc = Long.toString(Instant.now().toEpochMilli());
vars.put("sequence", epoc);

In neoload I will use,
context.variableManager.setValue("sequenceNumber",epoc);

but I get error on the use of import statement.