can make change the text inside a canva template automatically?

Bulk Create handles images too if you need a different photo per row. Watch the text length. The text box doesn't adjust to a long cell, so a few designs will come out with text overflowing or wrapping badly. Flip through the whole batch before anything goes out.

Only properly on Canva Enterprise. Filling a template with data through the API (brand templates with data fields) is locked to that plan, so on Pro you'll hit a wall. What works on Pro is Bulk Create inside Canva: connect a spreadsheet, map the columns to text boxes, it spits out one design per row. Not automated end to end, but if you're doing a batch a week it's fine. If it really needs to run hands-off, a dedicated image templating tool that has a Make module is the usual route.