Alternatively could you take the bottom out of a pot,I use flower buckets from the supermarket & drop it over the top of the plant, down to the compost in the grow bag & fill up with more compost, as previously said tge plants will grow more roots, you’ll need to remove the leaves below the compost level. Then when fruits have set, feed from the top of the pot & water at the bottom & youll have successfully done some as ring culture plants