Hi Marcin,
an alternative solution could be developing a custom algorithm that works directly with the JSON content.
PRO:
+ you have only associate the custom algorithm to the column in the inventory
CONS:
- you have to develop the custom algorithm or ask for it to professional services (Delphix or a partner like us)
- you have to download all the content from the DB column towards the Delphix Masking Engine and so if the content is very large, you could overflow the network.
Best Regards.
Gianpiero Piccolo