Dynamic row value insertion to the database

i have a recipe form of which ingredient, unit and quantity fields row can be added dynamically, I wanted to add these field into a single column named ingredient in database.

for now, the first row values is inserted in db as {"ingredients":["flour"],"quantity":["2"],"unit":["cup"]}

How can i insert the added row data too in this column? ingredient is the column where i want to insert these datas. Can you explain it with an example?

I know its the basic thing for you, but as a beginner its bit difficult for me to understand. Please help me out. Thank you!

via Chebli Mohamed