I also got quite frustrated with the fact that they let you on board no problem off boarding seems to be a topic Infoblox have no interest in helping out with.
however, if you look at the export, you get a text readable configuration file from Infoblox and with that you can write a script to extract the relevant data and give you a list of windows commands you can run on your DHCP server to re-create all the spaces with Options and other exciting things
This will obviously not be supported by Microsoft, but this is how I accomplish this goal using A script from my website, the link is below. Let me know if it helps you out.
https://www.a6n.co.uk/2024/07/infoblox-dhcp-more-to-windows-dhcp.html?m=1