No, such a feature is not available. Some years ago in a workshop for Passolo customization I created an exercise for that. Solution could be a small macro. It loops the selected entries in your translation lists and then converts the strings into UPPERCASE. Could be enhanced to also do lower and camel case.

Sub Main
    Dim prj As PslProject
    Set prj = PSL.ActiveProject
    Dim trn As PslTransList
    Set trn = PSL.ActiveTransList
    Dim i As Long
    For i = 1 To trn.StringCount(pslSelection)
        Dim t As PslTransString
        Set t = trn.String(i, pslSelection)
        t.Text = UCase(t.Text)
    Next i
End Sub

Dear Achim,

Thank you for your reply. This answers my question, alas the problem persists.

Hi Carmen Vollmuth - a potential option could be to export the Passolo translation lists as SDLXLIFF using the new SDLXLIFF export/import and then use Studio as a translation editor with all its productivity bells and whistles. (One of the main driving factors behind this new export was to allow Studio to be used at the translation step so users can benefit from its wider range of such productivity features). Thanks, Daniel

Thank you, Daniel, for this sharing this option. It is worth looking into while the Macro is in the making.