Hmmm well.
I was looking for “Truelayer to Google Sheets” and found this site - but it doesn’t seem to actually be functional. (And I don’t know if I trust random webpage I found…)
So then I found this Blog Post from TrueLayer about building a simple app to retrieve balance. (with relevant GitHub page for it here)
I know about 3% of what the page was explaining, so I’m trying to see if I can do some basic Python stuff to basically copy and paste the lot into.
So, so far, nothing to report, but if I work out how to do it I’ll post back 
Edit - also this comment in another thread suggested it was possible -