Hello,
there are theoretically two ways, how to resolve this issue.
1) you can replace putc function which is used by printf by LPUART_DRV_SendBlocking function.
2) you can use vprintf function which uses buffer and this buffer can be send by LPUART_DRV_SendBlocking. For this purpose, you can create your own printf function (for example my_printf).
Regards,
Martin