Sooner or later, your ants will die of natural causes (each ant has a short lifespan). You may be able to collect a few for ID by an entomologist. Honestly, any ID will require either bugs you kill (cotton swab, alcohol, preserve in a vial with alcohol) or ones you find dead and preserve.
Or, ask around if you have a university entomology program. Someone my be willing to collect ants from your plant for ID.
My son is an entomology graduate student, and I know that in order to identify, they need the insect (some ID requires a microscope).
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