If you are looking the easy way to export EMLX to PST. It is possible to using FixVare EMLX to PST Converter. This utility allows you to convert multiple EMLX files without losing any data. Using the application is easy due to its user-friendly UI. Both non-technical persons and technical people can convert.
Also, protects the attachments, sender information, and formatting of your email. All versions, including 2021, 2019, 2013, 2010, 2007, and older ones, are compatible with Outlook. Additionally, this tool allows you to convert 25 EMLX files to PST for free.

Read more: https://www.fixvare.com/products/emlx/pst/