Hi, Tamara. You are on the right track - if it existed! :-)
I took a look here and did not see the customer note listed:
My guess is that it is not (yet) exposed via Liquid, just in the Admin area. You might want to email support to request/confirm.
I don't know the reason why you want to access this via liquid, however MetaFields might work for you. Those you can access easily from anywhere you have a customer object.
Thanks for your answers,
I was checking Metafields and seems can be works, but I need create them from a customer register from, since I need store additonal information about customers when they is sign up, I'm trying something like this
<input type="hidden" name="customer[metafields][namespace][key]" value="respuesta1" />
<input type="hidden" name="customer[metafields][namespace][value]" value="pregunta1" />
But doesn't work,
Please any idea how I can do that!