Upload on a running website

I have a site (https://example.com) that this site has it’s content.
Is it possible to run Frontity on this domain ?
(I’ve designed my react theme with frontity but I don’t know what to do with my files!)
I mean I don’t want to change the backend and frontend location.
I just want to change the frontend theme.
Where is the documentation for this situation?

run frontity in embedded mode. you will add a plugin that replaces the theme with your frontity application

you still need to deploy your frontity application to eg Vercel but users will visit your wordpress site