How do we get state of a flag in set -o ...

[Budi]

How do we get state of a flag in set -o ... that has no directly alias
set [-+] , e.g.
set -o posix
or
set -o vi
?

not, e.g. set -o errtrace , as it can be retrieved by echo $-

then it'll be determined if letter e exists at the output string .
Please help sincerely.