There's a closed pull request on the void-packages repository

connman: add build option "nftables"
https://github.com/void-linux/void-packages/pull/31957

Description:
Allow to build with support for nftables instead of iptables.

From ./configure --help:

    --with-firewall=TYPE    specify which firewall type is used iptables or
                            nftables [default=iptables]

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- [ ] I generally don't use the affected packages but briefly tested this PR

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