Constant ADD_BLOCKED_BYS 

pub const ADD_BLOCKED_BYS: &str = "mutation($block0:AddBlockedByInput!,$block1:AddBlockedByInput!,$block2:AddBlockedByInput!,$block3:AddBlockedByInput!,$block4:AddBlockedByInput!,$block5:AddBlockedByInput!,$block6:AddBlockedByInput!,$block7:AddBlockedByInput!,$block8:AddBlockedByInput!,$block9:AddBlockedByInput!,$block10:AddBlockedByInput!,$send0:Boolean!,$send1:Boolean!,$send2:Boolean!,$send3:Boolean!,$send4:Boolean!,$send5:Boolean!,$send6:Boolean!,$send7:Boolean!,$send8:Boolean!,$send9:Boolean!,$send10:Boolean!){ block0:addBlockedBy(input:$block0) @include(if:$send0){issue{id} blockingIssue{id}} block1:addBlockedBy(input:$block1) @include(if:$send1){issue{id} blockingIssue{id}} block2:addBlockedBy(input:$block2) @include(if:$send2){issue{id} blockingIssue{id}} block3:addBlockedBy(input:$block3) @include(if:$send3){issue{id} blockingIssue{id}} block4:addBlockedBy(input:$block4) @include(if:$send4){issue{id} blockingIssue{id}} block5:addBlockedBy(input:$block5) @include(if:$send5){issue{id} blockingIssue{id}} block6:addBlockedBy(input:$block6) @include(if:$send6){issue{id} blockingIssue{id}} block7:addBlockedBy(input:$block7) @include(if:$send7){issue{id} blockingIssue{id}} block8:addBlockedBy(input:$block8) @include(if:$send8){issue{id} blockingIssue{id}} block9:addBlockedBy(input:$block9) @include(if:$send9){issue{id} blockingIssue{id}} block10:addBlockedBy(input:$block10) @include(if:$send10){issue{id} blockingIssue{id}}}";

Up to MUTATION_BATCH native blocked-by relationships a copy adds to the issues it created, in one request.