HI Gael
it's possible to call a SAPGUI transaction cia SAPGUI for HTML. However that does NOT mean the transaction provides a way to pass in a parameter value. Most SAPGUI transactions provide no or few options for passing parameters.
This is the way it used to be done but this is very old now so you will need to see if it works for your transaction.
How to prefill fields and skip first screen with webgui? - Wiki - SCN Wiki
it's important to recognise you will be creating an incoherent user experience with this type of approach & it is not a recommended approach. Just because you can doesn't mean you should.
If it is simply display you want a more effective option would be to create a simple Fiori app or use a BSP to handle the parameter or use a WebDynpro Abap app instead
Hope that helps
Jocelyn
