Hi Shambhu,
You can use SSISDB for reference,
for example:
SELECT
P.name AS PackageName,
P.description AS PackageDescription,
C.name AS ConnectionManagerName,
C.description AS ConnectionManagerDescription,
C.connectionstring AS ConnectionString
FROM
[SSISDB].[catalog].[packages] AS PKG
JOIN
[SSISDB].[catalog].[projects] AS PRJ ON PKG.project_id = PRJ.project_id
JOIN
[SSISDB].[catalog].[package_parameters] AS PP ON PKG.package_id = PP.package_id
JOIN
[SSISDB].[catalog].[environments] AS ENV ON PRJ.environment_id = ENV.environment_id
JOIN
[SSISDB].[catalog].[environment_references] AS ER ON ENV.environment_id = ER.environment_id
JOIN
[SSISDB].[catalog].[referenceables] AS REFS ON ER.reference_id = REFS.reference_id
JOIN
[SSISDB].[catalog].[connections] AS C ON REFS.object_id = C.object_id
ORDER BY
PackageName, ConnectionManagerName