Microsoft Teams: Need to Provide 'Edit in Teams' for Sharepoint Documents in Custom Tab

I need to provide option of 'Edit in Teams' in custom tab containing document library.

I have tried using

1. Deeplinks:

 microsoftTeams.executeDeepLink('https://teams.microsoft.com/_#/docx/viewer/teams/https:~2F~2Ftenant.sharepoint.com~2Fsites~2FTestTeam~2FShared%20Documents~2FCustom~2FContractExecutableTemplate.docx?threadId=19:7ba74a73a2d04bb19bc417e52c1f5101@thread.skype&baseUrl=https:~2F~2Ftenant.sharepoint.com~2Fsites~2FTestTeam&fileId=603F7416-260C-44FA-AE8E-1E4B7D4C2AC0&ctx=files&viewerAction=edit')"

but it gives error and also directly opening url like

2. Directly use deeplink url 

"https://teams.microsoft.com/l/_#/docx/viewer/teams/https:~2F~2Ftenant.sharepoint.com~2Fsites~2FTestTeam~2FShared%20Documents~2FCustom~2FContractExecutableTemplate.docx?threadId=19:7ba74a73a2d04bb19bc417e52c1f5101@thread.skype&baseUrl=https:~2F~2Ftenant.sharepoint.com~2Fsites~2FTestTeam&fileId=603F7416-260C-44FA-AE8E-1E4B7D4C2AC0&ctx=files&viewerAction=edit"

but it gives launcher page instead of opening the app

Since there is no proper documentation of executeDeepLink any help would be appreciated.