For CC library assets anchored inline with text, can these be made to accomodate font size choices in reflowable epubs?

Jutoh is supposed to be able to do this, but I can't quite get it.

So far I cannot see how to make an asset, a tiny image to suit 12 point original font, change if the e reader changes font size.

Creating my assets was many steps also, and I figured it out with unfortunately no luck finding steps in the forum. But they work perfectly InDesign and also Affinity Publisher. They also change size of course manually in the document with no loss. Thank you!