Create retention policies for specific measurements

Hello everyone,

I have influxdb 2.6 with only one bucket. I need to create retention policies but documentation is pretty confusing about it. What I want to achieve is to set different policies for different measurements, but can’t find online nor in documentation.

So if I have measurements CPU, RAM, DISK, I want to delete automatically data older than:
CPU: 10days
RAM: 30days
DISK: 20days

Can someone point me how to do this properly? When I execute influx v1 dbrp list I get:
ID Database Bucket ID Retention Policy Default Organization ID
0a69b0135e4f7000 telegraf 27db965e0619c187 30d true 3d5302e9eb21ef90

VIRTUAL DBRP MAPPINGS (READ-ONLY)

ID Database Bucket ID Retention Policy Default Organization ID
082969122e28bf76 _monitoring 082969122e28bf76 autogen true 3d5302e9eb21ef90
27a2a04658da2efa _tasks 27a2a04658da2efa autogen true 3d5302e9eb21ef90
27db965e0619c187 telegraf 27db965e0619c187 autogen false 3d5302e9eb21ef90