Custom long/lat spatial predicate pairs for geosparql

At the moment geosparql supports many of the old jena-spatial functions. 
The jena-spatial module also had custom long/lat and also custom WKT predicates. At the moment we still use the old jena spatial module, but when the assembler file for geosparql is ready in  jena 4.4, I think we can switch.

Writing an assembler which uses both jena-text and geosparql is how we've mostly used the jena-spatial module.

One remaining issue we have in our data (from external datasets), is custom long/lat predicates. Bringing support for these would be nice. I tried to look at the code, and it seems the geo:long,geo:lat are translated in https://github.com/apache/jena/blob/main/jena-geosparql/src/main/java/org/apache/jena/geosparql/configuration/GeoSPARQLOperations.java#L749

Would it work/be enough to look up/reuse the jena-spatial assembler predicates, and also loop through these pairs in the convertGeoPredicates(Dataset dataset, boolean isRemoveGeoPredicate) or should there be a new method to convert custom predicates? 

This is how the old assembler looks, from the jena-site:

  # custom geo predicates for 1) Latitude/Longitude Format
    spatial:hasSpatialPredicatePairs (
         [ spatial:latitude :latitude_1 ; spatial:longitude :longitude_1 ]
         [ spatial:latitude :latitude_2 ; spatial:longitude :longitude_2 ]
         ) ;