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Hi,
From the question I understand that you want to have an application using React that authenticates with Cognito using OIDC, uses the Cognito hosted UI and uses the implicit grant type.
This can be achieved, I am attaching the following documentation that goes over setting up the hosted UI with AWS amplify here (1). You can add an OIDC provider to your user pool by following the steps outlined in this documentation here (2). Lastly you can use an implicit grant, I am attaching the following documentation that goes over the difference between the types of grants available (3). One note to mention is that a PKCE challenge can be passed with an implicit grant but is not used because the /oauth2/token is not accessed. This is because implicit grants return the ID and access token directly and do not access the refresh token.
I hope you have a great rest of your day!
References
(2) https://docs.aws.amazon.com/cognito/latest/developerguide/cognito-user-pools-oidc-idp.html
(3) https://aws.amazon.com/blogs/mobile/understanding-amazon-cognito-user-pool-oauth-2-0-grants/