Hi @JanVanek ,
Do you want to enable "SharePoint Integration" in Power Portal or D365 CRM Form?
Do you want to display the related documents within the Profile web page?
If you want to display the related documents within the Profile web page in your Portal, I afraid that there is no way to achieve your needs in PowerApps currently.
Currently, the "SharePoint document management" functionality is bind to Entities in CDS, and the related documents could only be displayed within Entity forms related to corresponding CDS Entity. The Profile web page is a pre-defined (built-in) web page in Portal, which is not related to any CDS Entity, so you could not enabled the "SharePoint document management" feature within Profile page.
If you would like this feature to be added in your powerApps, please consider submit an idea to PowerAppd Ideas Forum:
https://powerusers.microsoft.com/t5/Power-Apps-Ideas/idb-p/PowerAppsIdeas
Best regards,