SAML 2.0 Assertion grant with iOSAndroid SDK

Hi, Is it possible to implements SAML 2.0 Assertion grant using iOS and Android SDK?
I need to have this implemented to migrate an application to Okta. Current application have custom tokens and we need to switch to okta OIDC. We have a custom SAML IDP to perform this flow but we are with issues storing tokens. Is this flow possible be executed from inside mobile apps using the SDKs and without present the browser to users?