Attribute Rules - Lat/Long in Decimal Degrees

[SierraPelizza]

Using ArcGIS Pro 3.5

I am attempting to set up an attribute rule which will calculate the Lat/Long for a point feature class. I need the results to be in Decimal Degrees.

My layer is currently in NAD 1983 StatePlane Florida East FIPS 0901. I know I need to get the layer to be WGS 1984 if I want decimal degrees.

Is there a way to accomplish this transformation and calculation through just an attribute rule? I would like to avoid reprojecting/adjusting the spatial reference on the actual layer itself and only have this transformation happen for my Lat/Long fields with the current State Plane coordinate system.

I cannot figure out how to accomplish this, or if this is possible. I have seen many posts from years ago saying it wasn't possible at the time, but I'm not sure if this functionality has been added yet. 

Any help or advise is appreciated 🙏

[DavidPike]

I still think we're stuck with the Geometry functions being limited by "any of these functions must match the spatial reference of the profile's context, which controls the execution of the expression."
Geometry functions | ArcGIS Arcade | Esri Developer

There is an Idea here - Arcade projectAs Geometry Function

I think you'd need to roll your own with something like the Helmert transformation - Wikipedia or GenAI some formula for your coordinate system. 

[SierraPelizza]

I had a feeling this may be the case - thanks for your input! Will have to do some digging to find a conversion that may do the trick.