Your comments

In our case, we use Bitbucket server but I am not sure if this kind of server side information is available. I see that even Bitbucket team has one similar open request that is still gathering interest https://jira.atlassian.com/browse/BSERV-7116 .
Another kind of problem there is that we can create a local branch in Smartgit and then push it into server but the information about the source branch cannot be transferred into the server.

What I can imagine is to utilize the base branch information from the local Smartgit gitflow in Git config file if available, for example: