You should be able to decode the bearer token and get the following
{
"id" : "1600361729831_7c314c691",
"client_id" : "UDPWeb1",
"user_id" : "8E5E47DA4706D5D@AdobeID",
"state" : "{\"session\":\"https://ims-na1.adobelogin.com/ims/session/v1/ZjZmMWE3YTQtmRlLS04RTVFNDdEQTQ3MDZENUQ1OTYmVJRA\"}",
"type" : "access_token",
"as" : "ims-na1",
"fg" : "UY6ROZRAVLPBL37QAP4======",
"sid" : "1599771421938_-8d32-425e-815d-b734beb48abc_ue1",
"moi" : "db01",
"c" : "kg9B1xnV4UpPgkVi/gQ==",
"expires_in" : "86400000",
"scope" : "AdobeID,openid,adobeio_api,gnav,read_organizations,additional_info.projectedProductContext,unified_dev_portal,additional_info.roles,read_pc.dma_bullseye,session,adobeio.appregistry.read,adobeio.appregistry.write,sao.creative_cloud,account_cluster.read",
"created_at" : "1600361729831"
}
The following libs will help you decode.
jwt-decode
njwt
The scopes property defines access granted to the token.
There are also IMS apis you can call using the token to get information about the user.
Also, I found this lib https://github.com/adobe/aio-lib-ims
It might help you out.