I don't know about vanilla Misskey, but CheeryPick has a tab "Blocks and Mutes" at settings/mute-block that has the following things
Purpose
It helps to filter out unwanted content such as triggering topics, or just content you don't want to see and it would be useful to have something similar in-app
Do you want to implement this feature yourself?
[ ] Yes, I will implement this by myself and send a pull request
Summary
I don't know about vanilla Misskey, but CheeryPick has a tab "Blocks and Mutes" at settings/mute-block that has the following things
Purpose
It helps to filter out unwanted content such as triggering topics, or just content you don't want to see and it would be useful to have something similar in-app
Do you want to implement this feature yourself?