Allowing certain apps to be blocked but not at the same time every day

I’ve seen the instructions for screen time controls but from what I can tell, you have to set it for the same time consistently

What I’m looking for is a focus mode that allows me to use only certain apps (mainly Spotify and Google Drive/docs) but only when I turn it on. I’m self employed and work from home and so I have full control over when I work and do it at different times each day so I’d like to just have a focus option I can toggle off and on as needed

Is this possible?