To know how ConnectALL handles the Log4j 2 vulnerability issue, please read the article here.

Why the values is not shown or displayed from the Select field/Lookup field of JIRA when I try to do value mapping?

Please check if the corresponding field is available as part of the Create screen. It's mandatory that the corresponding Select/Lookup field is part of the Create screen for ConnectALL to read the relevant values via REST calls.