You can draw as many texts as you like, the issue is not single vs multiple or how far back, the issue is if you want to write text inside the price window, it’s not something you do from a backtest, it’s something you have do it from a probuilder code installed inside the price window (code ending with return, like the exemples in the drawtext documentation page).
So if your code is only a backtest to start with, you need to create an indicator version of it, in which you can use the drawtext command rather than an order, for each time an order is supposed to be executed in your backtest (=where your backtest arrows are).
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