How to customize RSS Feed based on user_meta field value?

Hi,

I’d like to create a custom RSS Feed based on one of my users’ meta field.

My user have the meta named “brand” which contain a text.
My posts and CPT have a taxonomy also named “brand”.

Basically, I’d like to generate a RSS which would retrieve post and CPT only if the taxonomy = the user meta field’s value.

Is it even possible to do it?
How?

Thank you for your support,

Regards