I'm definitely in too! Used Boost for ages. Now Reddit fucked up, entered Lemmy and I can't wait for the Boost app. GO!

I'm using Business Calendar for years and I think it's what you are looking for.

With BS you can set a task (via Google Tasks) and the app shows it every day on the calendar as active until completed or dismissed. You can configure the app to set a notification (could be permanent) while the task is active.

https://www.appgenix-software.com/