Found this in the user docs
Adding multiple sources into one table is to my view the whole point of linked tables. Hoping that this will be added. Wanted to give this a bit more attention.
I’ll check with the team regarding this request. 
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Hello @360Creators, I checked this with the team, and this request is a bit tricky. Each data sync integration has its own fields — even GitLab and GitHub, for example, differ — so it can become quite challenging to map what to sync and how.
Do you perhaps have any ideas on how this could be implemented, or examples from similar tools?
I was more thinking of internal baserow syncs. If you have multiple tables of Contacts, that I could say: these fields from this table and these fields from this other table combined into this one synced table. In the synced table I can then say “get these external fields mapped to this one field”. If I’m not mistaken Airtable has this, but it’s been a while since I used it there.
Oh okay, I see now. I’ll discuss this idea with the team again 