How to update the value on notes entity using a custom field?

Hi,

I want to update the data on notes entity using a custom date field.

So, tried with the below options :

1. Tried creating the custom date field on notes entity. But OOB, we cannot create custom fields on notes entity.

2. Tried to create the relationship between the custom entity and notes entity, but CRM doesn't support this as well.

Please let me know the suggestions for updating the data on notes entity using the custom field.

Thank you.