Attachment to a TSER
One answer
I don't believe this is currently an option in TSERs. If it's something you really need, I suggest adding it to the ideas portal:
https://ibm-ai-apps.ideas.ibm.com/?project=ENGTM&sort=popular
And coming back to add a link to the idea request on this thread so that hopefully anyone who wants this functionality will vote for it. It'll take interest from more than one organization (votes from people in different accounts) to get attention on it.