Add audible to child’s apple watch

We have 200 titles on audible we want to make accessible to my child. I go in the watch app for her apple child account. I look at the available apps. Audible is not listed. Audible is downloaded on my phone with 20 titles already downloaded. Why can I not see audible as an option for the child account. This is very challenging. I have spent the past hour trying to find any post that can help me. I should be given the opportunity to choose the apps for my child.