Supplying a dynamic list of tests

Is there a way to supply an initial list of tests or to provide tests from anything other than a pom.xml?
We gather a list of tests to run dynamically from a separate system in our pipeline. We use a custom test executor and save the results of these tests and push them to Jenkins as JUnit compatible XML.

I would like to be able to feed the separate dynamic list of required tests to the plugin, then have it look at previous build results and run times, if such a thing exists, and then build my list/batches of tests.

I'm trying to follow the blog post here: https://jenkins.io/blog/2016/06/16/parallel-test-executor-plugin/

and so far I have this basic template function which just had some pretty standard collate logic, which I've now ripped apart to try to use this plugin

def createTestDistribution(tests, batchSize) {
def splits = splitTests parallelism: [$class: 'CountDrivenParallelism', size: batchSize], generateInclusions: true
println "${splits}"

return splits.findAll{ it.includes }.collect{ it.splits }
}

Which I feel like should be more than suitable for my purposes, but I have no idea what to do with my initial array of tests.