bond_extra_other: TxDescriptor<{
    extra: NominationPoolsBondExtra;
    member: MultiAddress;
}>

origin bonds funds from extra for some pool member member into their respective pools.

origin can bond extra funds from free balance or pending rewards when origin == other.

In the case of origin != other, origin can only bond extra pending rewards of other members assuming set_claim_permission for the given member is PermissionlessCompound or PermissionlessAll.