I'm also having a hard time documenting this time in the P52 format. For right now, I'm just making traditional LO's about whatever stories I want, and trying to take pictures when I remember. I journal almost every day so I know I can use that later.
But honestly I think March and April will be full of three things- comfort media we're consuming, screenshots of texts between my family and friends (also screenshots of what they put up on social media) and memes- so so many toilet paper memes. This is not too different from what I usually document. I use these things a lot in my PL anyway. You could use any of that to fill in blanks in your weeks.
I've also been saving a lot of news articles in my journal, stats, world news, tech news, news from the cities where my family lives. I think I'm going to do something separate with that. There's a lot and it's overwhelming to add that to my regular PL. I do want to document it somehow though.