add custom attribute to primary button of fluent ui

Question

I need a unique custom attribute on the clickable part of fluent ui primary button. when I put on it custom attribute that starts with data- for example

    <PrimaryButton data-testid="clickButton" 
    text={props.btnText} href={props.link} target="_blank"  />  

it does work but if the custom attribute doesn't start with the word data- like in my case it just ignores it for example:

     <PrimaryButton digitaldata-collections="Export" 
     text={props.btnText} href={props.link} target="_blank"  />

it there another way to add it?