Extending Vue Client with RPT Tokens

Hi all,
I’m using keycloak client on my Vue application, as described below,

https://www.keycloak.org/securing-apps/vue

Now I’m planning to move RBAC controls to keycloak rather than checking authorization on my backend. Everything is prepared on backend side and it works with RPT tokens. But I couldn’t decide how to get RPT token after keycloak login page redirects the user to my app to access backend methods from the Vue UI. Is there a predefined function on keycloak client, or should I call keycloak token api manually(axios or similar)?

Thanks
Emre