Can I use a Contact Custom URL in a Wix Menu?

I am updating (replacing) a website for a non-profit organisation, that was created around 2000 in HTML code. I have managed to create the site in Wix using purely drag and drop, and have used Mailchimp to maintain the membership list and upgrade newsletters from a PDF file emailed using BCC.

I have created the Wix website with private pages, and would like to maintain the url to each users Mailchimp account page in a Wix Contact custom URL. I would then like to have a menu entry on the Wix site that calls the custom URL ( or a link on a page that does this). I haven’t come across any form of placeholder for Contact fields I can use in the URL field when adding a Link to a menu, so assume I will need to add some code to achieve this. As I would rather be creating content for the website than learning to code would someone mind providing an example of code or pointing me to a sample I can work from? Thanks.

Ok, I’ve dived into Wix coding and have managed to extract the current user ID and assign it to a variable, and I can load an external website into a Wix web page based on the content of a string variable containing the URL. Older forum posts imply that extracting user information from the CRM apart from email or roles needs to be done from data stored a separate database. However I see new functionality was released on 19 Feb 2019:
“Wix Code API: wix-crm-backend.getContactById()” which looks like it might do what I need. However the code examples don’t show how to retrieve a users information based on userId and get it back into a ContactInfo data type. I’ve figured out the rest by looking at example code and testing line by line, but it looks like getContactById() is too new and the examples on the help page only seem to be for creating a new Contact.