openVPN mbedTLS support

Turris Omnia - rtrom01
Turris OS 3.9.6
Kernel 4.4.119-082ea0f4a4e204b99821bedcb349ed54-0
OpenVPN 2.4.4 arm-openwrt-linux-gnu
libustream-openssl 2015-07-09-c2d73c2261…2d3
luci-ssl git-17.212.24321-49c3edd-1
libmbedtls 2.4.2-1
px5g-mbedtls 4

Since v2.4 OpenVPN has support for mbedTLS however it seems not being avaible in the Omnia repo despite being implemented in the openWRT repo

openvpn --version

OpenVPN 2.4.4 arm-openwrt-linux-gnu [SSL (OpenSSL)] [LZO] [LZ4] [EPOLL] [MH/PKTINFO] [AEAD]
library versions: OpenSSL 1.0.2n 7 Dec 2017, LZO 2.0

Is libustream-mbedtls required?