Yes
The equivalent is
For Getting
GET https://api.twitch.tv/helix/extensions/configurations?broadcaster_id=foo&extension_id=bar&segment=broadcaster
For Setting
PUT https://api.twitch.tv/helix/extensions/configurations
With JSON body:
{
"extension_id": "bar",
"segment": "broadcaster",
"broadcaster_id": "foo",
"content": "whatever"
}
The segment is moved from a route param to a query string param or body param instead.
Code Example/test tool: Extension Config Tool | Twitch API Example