'Utf8mb4 support in mariadb 10.3

I am migrating MariaDB 5.5 to 10.3 Currently 5.5 is not supporting the Utf8mb4. If I have index larger than 767 I am getting error as below

Specified key was too long; max key length is 767 bytes

Does MariaDB 10.3 support longer length for index and column?

Does MariaDB 10.3 support Utf8mb4 without modifying the column or index length



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