Elasticsearch Token Service tokens have specific properties that make them difficult to use for your use case, specifically that they have very short life ( by default 20 mins and up to 1hr ) after which you either need to use the refresh token to refresh it or get another access token. You can use bearer tokens in your requests to Kibana but you need to enable the Token authentication provider in kibana , see Authentication in Kibana | Kibana Guide [8.11] | Elastic, but whether this is suitable for your scenario, I doubt it.
I can't really unwrap how you tried it and what Exactly failed ? This is the most obvious way forward for you, so I'd suggest we focus on making this work. There are numerous examples in previous posts in this forum to help you, start with Nginx reverse proxy for kibana that contains further links to other relevant posts