You might want to try to use for-each parallel + private trigger. You will need to play around with the parallel number to limit the resource. Note that, all parellel execution with private trigger will be consuming the same execution's memory thresh...

Unfortunately, our JS task uses Rhino engine which doesn't support Object.values. https://mozilla.github.io/rhino/compat/engines.html#ES2017-features-Object-static-methods-Object-values