I want to create a custom component like you have created in this blog but this blog refers to Rasa 1.x version which is not valid for the newer versions as per your note.
Note! This blogpost was made with Rasa Open Source 1.x in mind. The code won’t work for newer versions of Rasa.**
Do you have any new blog or video for Rasa 3.x ? if not, please what do you recommend to do for adding custom components?