IE

I look at someone's profile

Click "view their following feed"

Then I can see their version of Twitter, based on who they follow

Note that it's unlikely this will show other people's "for you" since that reveals so much personal interest and historical private interactions

It must be a first party feature not an addon or something like that.

It can be paid, I just want to be able to do it for under $100 a month ppp 2023