There is no official package for React js in Adobe Campaign. based on your use case, you have to go with Custom implementations. one simple example would be
Adobe Campaign Classic:
Create to backend services(React JS/Node JS/.net/Java).
Service one will be used to establish the connection from Website/Campaign and get a session token for that connection using SOAP API.
Service two will be responsible for GET/POST operation from website to campaign after validation using SOAP API.