Hi @Olga Andreeva,
Per my test, you could use following api
POST https://graph.microsoft.com/v1.0/search/query
{
"requests": [
{
"entityTypes": [
"driveItem"
],
"query": {
"queryString": "Fir AND Path:https://tenant-my.sharepoint.com/sites/sitename/libraryname AND ParentLink:/foldername"
}
}
]
}
Here is the test result
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