Ionic components - variable in variable, attribute variables

In my component.html I got this.

    <h3 class="error-message purple">{{errorMessage}}</h3>

    <p class="error-text">

And I use it in the page as

myErrorMessage="No matching profile"
myErrorText = "We’re sorry, no profile matches M49278-1. Please try again or visit Member Services for assistance."

So my question is how do i add in the ErrorText variable another variable for the member-id?
Is that possible or?

Another question is for example a button route, can I put a variable for an attribute?