What is the namespace of SQL Server 2017 database?

What is the namespace of Azure Analysis Services / SQL Server 2017 (1400)?

So i have the following script that returns connection string of databases under server

Import-ModuleSqlServer#SSAS 1103 
$oldAS =New-ObjectMicrosoft.AnalysisServices.Server
$oldAS.connect("server1")

foreach ($db in $oldAS.Databases){#$dbName = $db.NameWrite-Host $db.Name-Fore green
  $db.DataSources|ForEach-Object{$_.ConnectionString}}#SSAS 1200-1400 
$AS = new-ObjectMicrosoft.AnalysisServices.Tabular.Server
$AS.Connect("server1")

foreach ($dbt in $AS.Databases){
  $dbName = $dbt.Name
  $dbName
  $dbt.model.datasources[0].ConnectionString}

the first connection/namespace is used for compatibility levels 1103 the 2nd connection/namespace Microsoft.AnalysisServices.Tabular.Server is used for db's 1200-1400

however, we recently got databases that are 1400 but have a completely different format of connection string. the connection seems to be in JSON, even when looking at it from properties, compared to the traditional long connection string

i.e.

UserId=;DataSource=;PersistSecurityInfo=True

VS

any databases with a data source of that format in the picture is not displaying back

is there another namespace used to get this type of connection?