Please help us help you and fill where relevant:
Your LimeSurvey version: 6.5.4
Own server or LimeSurvey hosting:aeonfree
Survey theme/template:
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I added a new menu entry called "Text responses statistics" which is aimed at analyzing each survey's textual responses.
I have a.  "TextAnalyz.php" that has functionning script that does the text analysis and is completely separate from LimeSurvey.
However I don't know how to link the file "TextAnalyz.php" to Limesurvey, especially since I need its database.

Thank you in advance.

Maybe create it as plugin ?

2 way :
www.limesurvey.org/manual/NewDirectRequest , sample : gitlab.com/SondagesPro/ExportAndStats/qu...ParticipationAndStat
pluginhelper (admin page) : www.limesurvey.org/manual/Add_new_menu_and_view_by_a_plugin , sample : gitlab.com/SondagesPro/coreAndTools/orga...?ref_type=heads#L286


3rd solution : Controller : gitlab.com/SondagesPro/coreAndTools/ResetPasswordController