Why there is no openwrt img for M2+

Banana Pi SBCs design BPI-M2+/BPI-M2 Zero/BPI-P2 Zero(H3)
1

Sorry I am not good at English

why there is no openwrt img for M2+？ I see that

https://wiki.openwrt.org/doc/hardware/soc/soc.allwinner.sunxi?s[]=banana&s[]=pi

the H3 is support trunk repo and Orangepi also has openwrt img

2

OpenWRT project with BPI-M2+

https://openwrt.org/toh/sinovoip/sinovoip_banana_pi_m2_plus