is it possible to front load HSA/FSA contributions rather a Goal amount/Pay period breakdown?

Summary:

We want to give employees the ability to front-load their HSA or FSA in order to pre-plan for upcoming retirement or other life event - so that they are able to contribute the max before that event.

Right now the system only appears to let you set up a Goal Amount that is then broken up into pay-period calculations. Has anyone been able to execute the front loading of these accounts and then stop when they hit the maximum? Much like retirement contributions.

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