This issue is resolved.
Thank you for suggestion ESP_harshal it helped with CA Certificate configurate later, I used dedicated PEM Certificate at end.

Also the main issue here was because of wrong callback that was registered with "mbedtls_ssl_send_t *MBEDTLS_PRIVATE(f_send);"

I am having this following error when accessing https URL E (128542) esp-tls-mbedtls: mbedtls_ssl_handshake returned -0x6C00 I (128543) esp-tls-mbedtls: Certificate verified. E (128544) esp-tls: Failed to open new connection E (128549) transport_base: Failed to open a new connection E (128559) HTTP_...