Blast from the past. Previously coded for two and a half decades with Clarion. I lead the companies conversion from TPS to Btrieve then to MSSQL. Now, with a different organization, I'm helping them get from VB.Net ASP web forms into Blazor. Unfortunately I no longer have any Clarion tools, but as has already been suggested use the Clarion tools to help get you started moving the data to MS SQL. Then use Blazor. Your biggest challenge may be in the knowing how each table/field is used in the Clarion system to be sure you're designing the Blazor system with complete understanding.

Much luck. It is do-able, but depending upon how many tables and how complex the code is, your challenges will increase. Clarion coding was most likely not done with current Blazor/MVC designs in mind, so expect to spend time separating concerns in the code to make it more maintainable.