How to dynamically enable a disabled tab?

I am able to disable the tab easily enough:

<ion-tab id="tabA" disabled="true" ...> however, based on a variable set within another tab, I am having a heck of a time figuring out how to re-enable “tabA”. How can I do this?

I have looked at a variety of other similar posts, but the other posts were never solved (at least not within the post).