Adobe portfolio

No, I'm afraid not.  The 12 Adobe Portfolio Themes are curated from top designers and made especially for Portfolio.  Owing to limitations of the platform, Themes are customizable to an extent but you can't do whatever you want.

https://portfolio.adobe.com/themes

You need to go to the links below for Portfolio help
https://help.myportfolio.com/hc/en-us/requests/new?ticket_form_id=177168
https://helpx.adobe.com/creative-cloud/how-to/create-portfolio-website.html
https://help.myportfolio.com/hc/en-us/articles/216489627-Manually-configuring-a-custom-domain
https://help.myportfolio.com/hc/en-us
https://portfolio.adobe.com/themes
https://portfolio.adobe.com/
And Lighrtroom Integrations
https://blogs.adobe.com/jkost/tag/portfolio
https://lightroomkillertips.com/getting-images-lightroom-adobe-portfolio-just-got-lot-easier/
https://digital-photography-school.com/create-beautiful-online-gallery-lightroom-classic-cc-adobe-portfolio-15-minutes/