We have AMP pages which includes clientlib as like in non-amp page. We are using data-sly-call to include the css of the clientlibs. But it's generating the css file as a link in the html at the run time. So the page is getting failed in the AMP page test. Is there any other way to include our clientlibs instead of link in HTL.
I don't think that the clientlib statements can include the clientlins inline into the (HTML-) page.
But I could imagine that this could be a good addon to ACS AEM Commons. ... maybe you want to post your request there  and ask if someone would work on it. You should also open a Adobe support ticket for this (new) feature.