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Before asking such questions, make sure you check the following resources:

See if a similar question hasn't been asked on unmet hours. This question is very similar
Check the Input Output Reference guide of EnergyPlus. Each object is described, and includes the output variables that are available. If your model has Coil:Cooling:DXSingleSpeed objects for example, thissection is pretty limpid.
Open the eplusout.rdd after a run... it lists ALL the output variables that are available for you, and doing a search on "Latent" will quickly tell you which one you need. See the answer by Aaron to see how to open it from within the openstudio application on the question I linked above or you can also find it in your file explorer. If your model is called "mymodel.osm" it'll be in mymodel\run\5-EnergyPlus\eplusout.rdd

Before asking such questions, make sure you check the following resources:

See if a similar question hasn't been asked on unmet hours. This question is very similar
Check the Input Output Reference guide of EnergyPlus. Each object is described, and includes the output variables that are available. If your model has ~~Coil:Cooling:DXSingleSpeed~~ Coil:Cooling:DX:SingleSpeed objects for example, this section is pretty limpid.
Open the eplusout.rdd after a run... it lists ALL the output variables that are available for you, and doing a search on "Latent" will quickly tell you which one you need. See the answer by Aaron to see how to open it from within the openstudio application on the question I linked above or you can also find it in your file explorer. If your model is called "mymodel.osm" it'll be in mymodel\run\5-EnergyPlus\eplusout.rdd

Now, you won't find this at the zone level, as highlighted in the I/O reference guide here there is no output variable for zone latent load.

You'll find this at the HVAC level. I already showed you which one you need in the case of a Coil:Cooling:DX:SingleSpeed for example, here is the same if you're using ZoneHVAC:IdealLoadsAirSystem