If you’re looking for organic amended/super soil, check out some of the SIP threads. Earthbox, City Picker, DIY, etc. methods have the same principle as octopots but with organic amended soil versus peat/perlite + soluble nutes.
Here’s a thread about SIPs with a healthy summary and lots of other links included. https://overgrow.com/t/crunchberries-probiotic-sip-thread/78727