The long answer is it's possible but not worth your time/effort. Power Apps is a server-side technology so a lot of its components are dependent on its live access to a Microsoft service online for it to be rendered properly. Is you ask about the offline ones, those are dependent on the PowerApps mobile app services.
If you just want to export layouts, you can probably extract part by part (div by div) but that's gonna be time-consuming. And you'll need extensive knowledge of how HTML/CSS are rendered when the app is played. Also, if you have that extensive knowledge, you'd be better off coding your own HTML web as you will finish it faster getting thru a lot of divs generated by PowerApps. You'd probably be better off using WebFlow / WordPress or WYSIWYG (what-you-see-is-what-you-get) apps similar to DreamWeaver.
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