Is there possibilty to add my own TTF to construct ?
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Yes and no.
TTF installed font needs to be installed on the OS of the client's computer.
But you can use webfont and use your own fonts as webfont, search for the keyword "Webfont" in the tutorials section.
Doesn't it work if you attach the font file to the Project (under "Files" in the Project bar), then have your text object(s) load it like it was a webfont? Works for me using OTF fonts (even though I didn't try it onto many devices to see).