Interpret text from 1.21.5

Hi there, I did 90% of my way to 1.21.5, for my tellraw, signs, loot tables and else, but one point became a mystery for me. It's about text changes, and i don't figure it out. Before i was able to store a text in a storage and get it interpreted in a book, or a tellraw. Now it just gives it without interpreting, i tried removing some elements, but i certainly miss something from this text components update... What do i need to change from 1.21.4 in this specific situation ? I can't write my commands cauz the server rejects them because of french value, but i don't know why -'