The recommended approach is to add a CASE WHEN construct that checks if the current row dimension member is not the total. If you have the Time dimension on rows, the calculation could look similar to the one below:
CASE WHEN [Time].CurrentHierarchyMember.Name <> '$total_aggregate'
THEN
CASE WHEN [Measures].[Created vs Resolved issues] < 0 THEN
"<i class='far fa-arrow-up' style='color:green'></i>"
WHEN [Measures].[Created vs Resolved issues] > 0 THEN
"<i class='far fa-arrow-down' style='color:red'></i>"
END
END
The report then could look similar to the one below:
eazyBI supports markdown formatting for a total row with version 6.4.
However, please make sure the rules work correctly for total rows. If needed use a different formula for totaling rows as it was suggested by @roberts.cacus.