@Alina_miss568 Iim not sure if I'm undestanding it a bit wrong by what you mean "bonus chapter"
So here are two of my interpretations and answers
1 - The new chapters coming out for Valentines
These are chapters that are canon to the "Ignorance is Bliss" work. Chapters 8 and 9 will cover most of Tanjiro's training arc, aswell as the consequences of what happened in chapter 7, with Nezuko now choosing to eat demons, instead of sleeping. A lot of changes are made to the canon because of this, and I have to think carefully on how i've arrange the dominos for them to topple over, while still characterizing the canon characters to the best of my ability as to how they act in the show. I tend to roleplay how the different characters would react to an event and work from there. But, I'm diverging too much. The chapters being posted on Valentines day are canon, not spin offs.
2 - Spin off shapters
Nope. I don't like the concept of interupting a story's flow for a cute oneshot or even an author's note. I feel like it takes the reader out of the story. Especially with such intensive themes. I want the reader to be constantly engaged, where every chapter flows into the last. A fanfic where you pick it up, and you will not be able to put down. Which is why I always end off a chapter with a cliff hanger, so that you're more likely to want to read the next one. So, no. No spin off chapters from me.