It appears that you cannot share a contacts list across profiles. Is there a way to have all profiles (that have "turn on phone calls & sms" enabled) share the same contacts list? Among others, I have two profiles; one for home and another for travelling away from home, and the use of these two profiles makes it difficult to manage my contacts (eg. I use silence, which can block calls coming from numbers other than those on my contacts list).
How to share contacts list across profiles that have Calls & SMS access
hack the database as the root user?
There used to be a file format for it called vcard. Look toward that direction in a general search and how to export/import a vcard file.
gk7ncklxlts99w1 (if you don't receive any practice-based elegant answer) if that sync is rather rare operation, you can consider manual sync via import/export of contacts and transferring the file locally via local ftp server (search for cross-profile file transfer).
If for some reason you can't follow it, then I would try another solely local option is to host DAV server locally (like radicale) and use DAVx5 or alike as a client. However, it's kinda questionable, as I couldn't find any non-termux based server and I haven't tried if that will face any other restrictions.
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I think this would be overkill for my use case. If there isn't a native option (besides manually transferring the vcard file, which isn't good enough), then I won't bother.