There are couple of threads related to json import but a default mode will be helpful as there is already .mode json for output and import support will be great.
I guess you are trying to do below from your comment.
$ echo '["Kate", "John", "Jim"]' > names.json
$ ./sqlite3
SQLite version 3.38.0 2022-02-22 18:58:40
Enter ".help" for usage hints.
Connected to a transient in-memory database.
Use ".open FILENAME" to reopen on a persistent database.
sqlite> create table users(id integer primary key, name text);
sqlite> insert into users(name) select value from json_each(readfile('names.json'));
sqlite> select * from users;
1|Kate
2|John
3|Jim
It seems readfile is from an extension but present in cli. json_each is present in standard sqlite core from 3.38.0 as json1 extension is also now part of core.
> Note that the readfile(X) and writefile(X,Y) functions are extension functions and are not built into the core SQLite library. These routines are available as a loadable extension in the ext/misc/fileio.c source file in the SQLite source code repositories.